# CVE-2026-126077: Action Pack: Possible sensitive session information leak in Active Storage proxy mode

Status: published. Published: 2026-11-10. Updated: 2026-11-14.

Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, When ActionDispatch::Cookies reads a signed or encrypted cookie that was written under a rotated secret (config.action_dispatch.cookies_rotations) or in the format that a :hybrid cookie serializer migrates from, it writes the cookie back to the response in the current format, and that write ignores request.session_options[:skip]. ActiveStorage::DisableSession relies on that option to keep the session cookie off the public, immutable responses of the Active Storage proxy controllers, but those controllers still load the session, so a request carrying an old-format session cookie could receive the rewritten session cookie in Set-Cookie on a cacheable response. A shared cache that stores such a response together with its Set-Cookie header could then serve one user's session to later requesters of the same URL, or serve an attacker's session to other users. Applications are affected when they serve Active Storage files through the proxy controllers, have a cookie rotation or a :hybrid serializer migration configured, and run behind a cache that stores Set-Cookie on public responses. This is a path around the fix for CVE-2024-26144. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.

## Remediation

- fix: actionpack (rubygems): GitHub reports patched versions 8.1.4.1. Check the advisory for the affected release branch. (source: GitHub GHSA-x6mj-8jx9-qhqv) — https://github.com/rails/rails/security/advisories/GHSA-x6mj-8jx9-qhqv
- fix: actionpack (rubygems): GitHub reports patched versions 8.0.5.2. Check the advisory for the affected release branch. (source: GitHub GHSA-x6mj-8jx9-qhqv) — https://github.com/rails/rails/security/advisories/GHSA-x6mj-8jx9-qhqv
- fix: actionpack (RubyGems): OSV reports a fixed version 8.1.4.1. Check the advisory for supported release branches. (source: OSV GHSA-x6mj-8jx9-qhqv) — https://github.com/advisories/GHSA-x6mj-8jx9-qhqv
- fix: actionpack (RubyGems): OSV reports a fixed version 8.0.5.2. Check the advisory for supported release branches. (source: OSV GHSA-x6mj-8jx9-qhqv) — https://github.com/advisories/GHSA-x6mj-8jx9-qhqv

## Affected products and versions

- rails / rails: >= 8.1, < 8.1.4.1 (affected); < 8.0.5.2 (affected). Source: CNA: GitHub_M
-  / actionpack (actionpack): >= 8.1, < 8.1.4.1 (affected, GitHub advisory range). Source: GitHub GHSA-x6mj-8jx9-qhqv
-  / actionpack (actionpack): < 8.0.5.2 (affected, GitHub advisory range). Source: GitHub GHSA-x6mj-8jx9-qhqv
-  / actionpack (actionpack): 8.1.0 (affected, RubyGems); 8.1.0.beta1 (affected, RubyGems); 8.1.0.rc1 (affected, RubyGems); 8.1.1 (affected, RubyGems); 8.1.2 (affected, RubyGems); 8.1.2.1 (affected, RubyGems); 8.1.3 (affected, RubyGems); 8.1.3.1 (affected, RubyGems); 8.1.4 (affected, RubyGems); Ecosystem version events: introduced 8.1.0.beta1; fixed 8.1.4.1. Source: OSV GHSA-x6mj-8jx9-qhqv
-  / actionpack (actionpack): 0.9.0 (affected, RubyGems); 0.9.5 (affected, RubyGems); 1.0.0 (affected, RubyGems); 1.0.1 (affected, RubyGems); 1.1.0 (affected, RubyGems); 1.10.1 (affected, RubyGems); 1.10.2 (affected, RubyGems); 1.11.0 (affected, RubyGems); 1.11.1 (affected, RubyGems); 1.11.2 (affected, RubyGems); 1.12.0 (affected, RubyGems); 1.12.1 (affected, RubyGems); 1.12.2 (affected, RubyGems); 1.12.3 (affected, RubyGems); 1.12.4 (affected, RubyGems); 1.12.5 (affected, RubyGems); 1.13.0 (affected, RubyGems); 1.13.1 (affected, RubyGems); 1.13.2 (affected, RubyGems); 1.13.3 (affected, RubyGems); 1.13.4 (affected, RubyGems); 1.13.5 (affected, RubyGems); 1.13.6 (affected, RubyGems); 1.2.0 (affected, RubyGems); 1.3.0 (affected, RubyGems); 1.3.1 (affected, RubyGems); 1.4.0 (affected, RubyGems); 1.5.0 (affected, RubyGems); 1.5.1 (affected, RubyGems); 1.6.0 (affected, RubyGems); 1.7.0 (affected, RubyGems); 1.8.0 (affected, RubyGems); 1.8.1 (affected, RubyGems); 1.9.0 (affected, RubyGems); 1.9.1 (affected, RubyGems); 2.0.0 (affected, RubyGems); 2.0.1 (affected, RubyGems); 2.0.2 (affected, RubyGems); 2.0.4 (affected, RubyGems); 2.0.5 (affected, RubyGems); 2.1.0 (affected, RubyGems); 2.1.1 (affected, RubyGems); 2.1.2 (affected, RubyGems); 2.2.2 (affected, RubyGems); 2.2.3 (affected, RubyGems); 2.3.10 (affected, RubyGems); 2.3.11 (affected, RubyGems); 2.3.12 (affected, RubyGems); 2.3.14 (affected, RubyGems); 2.3.15 (affected, RubyGems); 2.3.16 (affected, RubyGems); 2.3.17 (affected, RubyGems); 2.3.18 (affected, RubyGems); 2.3.2 (affected, RubyGems); 2.3.3 (affected, RubyGems); 2.3.4 (affected, RubyGems); 2.3.5 (affected, RubyGems); 2.3.6 (affected, RubyGems); 2.3.7 (affected, RubyGems); 2.3.8 (affected, RubyGems); 2.3.8.pre1 (affected, RubyGems); 2.3.9 (affected, RubyGems); 2.3.9.pre (affected, RubyGems); 3.0.0 (affected, RubyGems); 3.0.0.beta (affected, RubyGems); 3.0.0.beta2 (affected, RubyGems); 3.0.0.beta3 (affected, RubyGems); 3.0.0.beta4 (affected, RubyGems); 3.0.0.rc (affected, RubyGems); 3.0.0.rc2 (affected, RubyGems); 3.0.1 (affected, RubyGems); 3.0.10 (affected, RubyGems); 3.0.10.rc1 (affected, RubyGems); 3.0.11 (affected, RubyGems); 3.0.12 (affected, RubyGems); 3.0.12.rc1 (affected, RubyGems); 3.0.13 (affected, RubyGems); 3.0.13.rc1 (affected, RubyGems); 3.0.14 (affected, RubyGems); 3.0.15 (affected, RubyGems); 3.0.16 (affected, RubyGems); 3.0.17 (affected, RubyGems); 3.0.18 (affected, RubyGems); 3.0.19 (affected, RubyGems); 3.0.2 (affected, RubyGems); 3.0.20 (affected, RubyGems); 3.0.3 (affected, RubyGems); 3.0.4 (affected, RubyGems); 3.0.4.rc1 (affected, RubyGems); 3.0.5 (affected, RubyGems); 3.0.5.rc1 (affected, RubyGems); 3.0.6 (affected, RubyGems); 3.0.6.rc1 (affected, RubyGems); 3.0.6.rc2 (affected, RubyGems); 3.0.7 (affected, RubyGems); 3.0.7.rc1 (affected, RubyGems); 3.0.7.rc2 (affected, RubyGems); 3.0.8 (affected, RubyGems); 3.0.8.rc1 (affected, RubyGems); 3.0.8.rc2 (affected, RubyGems); 3.0.8.rc4 (affected, RubyGems); 3.0.9 (affected, RubyGems); 3.0.9.rc1 (affected, RubyGems); 3.0.9.rc3 (affected, RubyGems); 3.0.9.rc4 (affected, RubyGems); 3.0.9.rc5 (affected, RubyGems); 3.1.0 (affected, RubyGems); 3.1.0.beta1 (affected, RubyGems); 3.1.0.rc1 (affected, RubyGems); 3.1.0.rc2 (affected, RubyGems); 3.1.0.rc3 (affected, RubyGems); 3.1.0.rc4 (affected, RubyGems); 3.1.0.rc5 (affected, RubyGems); 3.1.0.rc6 (affected, RubyGems); 3.1.0.rc8 (affected, RubyGems); 3.1.1 (affected, RubyGems); 3.1.1.rc1 (affected, RubyGems); 3.1.1.rc2 (affected, RubyGems); 3.1.1.rc3 (affected, RubyGems); 3.1.10 (affected, RubyGems); 3.1.11 (affected, RubyGems); 3.1.12 (affected, RubyGems); 3.1.2 (affected, RubyGems); 3.1.2.rc1 (affected, RubyGems); 3.1.2.rc2 (affected, RubyGems); 3.1.3 (affected, RubyGems); 3.1.4 (affected, RubyGems); 3.1.4.rc1 (affected, RubyGems); 3.1.5 (affected, RubyGems); 3.1.5.rc1 (affected, RubyGems); 3.1.6 (affected, RubyGems); 3.1.7 (affected, RubyGems); 3.1.8 (affected, RubyGems); 3.1.9 (affected, RubyGems); 3.2.0 (affected, RubyGems); 3.2.0.rc1 (affected, RubyGems); 3.2.0.rc2 (affected, RubyGems); 3.2.1 (affected, RubyGems); 3.2.10 (affected, RubyGems); 3.2.11 (affected, RubyGems); 3.2.12 (affected, RubyGems); 3.2.13 (affected, RubyGems); 3.2.13.rc1 (affected, RubyGems); 3.2.13.rc2 (affected, RubyGems); 3.2.14 (affected, RubyGems); 3.2.14.rc1 (affected, RubyGems); 3.2.14.rc2 (affected, RubyGems); 3.2.15 (affected, RubyGems); 3.2.15.rc1 (affected, RubyGems); 3.2.15.rc2 (affected, RubyGems); 3.2.15.rc3 (affected, RubyGems); 3.2.16 (affected, RubyGems); 3.2.17 (affected, RubyGems); 3.2.18 (affected, RubyGems); 3.2.19 (affected, RubyGems); 3.2.2 (affected, RubyGems); 3.2.2.rc1 (affected, RubyGems); 3.2.20 (affected, RubyGems); 3.2.21 (affected, RubyGems); 3.2.22 (affected, RubyGems); 3.2.22.1 (affected, RubyGems); 3.2.22.2 (affected, RubyGems); 3.2.22.3 (affected, RubyGems); 3.2.22.4 (affected, RubyGems); 3.2.22.5 (affected, RubyGems); 3.2.3 (affected, RubyGems); 3.2.3.rc1 (affected, RubyGems); 3.2.3.rc2 (affected, RubyGems); 3.2.4 (affected, RubyGems); 3.2.4.rc1 (affected, RubyGems); 3.2.5 (affected, RubyGems); 3.2.6 (affected, RubyGems); 3.2.7 (affected, RubyGems); 3.2.7.rc1 (affected, RubyGems); 3.2.8 (affected, RubyGems); 3.2.8.rc1 (affected, RubyGems); 3.2.8.rc2 (affected, RubyGems); 3.2.9 (affected, RubyGems); 3.2.9.rc1 (affected, RubyGems); 3.2.9.rc2 (affected, RubyGems); 3.2.9.rc3 (affected, RubyGems); 4.0.0 (affected, RubyGems); 4.0.0.beta1 (affected, RubyGems); 4.0.0.rc1 (affected, RubyGems); 4.0.0.rc2 (affected, RubyGems); 4.0.1 (affected, RubyGems); 4.0.1.rc1 (affected, RubyGems); 4.0.1.rc2 (affected, RubyGems); 4.0.1.rc3 (affected, RubyGems); 4.0.1.rc4 (affected, RubyGems); 4.0.10 (affected, RubyGems); 4.0.10.rc1 (affected, RubyGems); 4.0.10.rc2 (affected, RubyGems); 4.0.11 (affected, RubyGems); 4.0.11.1 (affected, RubyGems); 4.0.12 (affected, RubyGems); 4.0.13 (affected, RubyGems); 4.0.13.rc1 (affected, RubyGems); 4.0.2 (affected, RubyGems); 4.0.3 (affected, RubyGems); 4.0.4 (affected, RubyGems); 4.0.4.rc1 (affected, RubyGems); 4.0.5 (affected, RubyGems); 4.0.6 (affected, RubyGems); 4.0.6.rc1 (affected, RubyGems); 4.0.6.rc2 (affected, RubyGems); 4.0.6.rc3 (affected, RubyGems); 4.0.7 (affected, RubyGems); 4.0.8 (affected, RubyGems); 4.0.9 (affected, RubyGems); 4.1.0 (affected, RubyGems); 4.1.0.beta1 (affected, RubyGems); 4.1.0.beta2 (affected, RubyGems); 4.1.0.rc1 (affected, RubyGems); 4.1.0.rc2 (affected, RubyGems); 4.1.1 (affected, RubyGems); 4.1.10 (affected, RubyGems); 4.1.10.rc1 (affected, RubyGems); 4.1.10.rc2 (affected, RubyGems); 4.1.10.rc3 (affected, RubyGems); 4.1.10.rc4 (affected, RubyGems); 4.1.11 (affected, RubyGems); 4.1.12 (affected, RubyGems); 4.1.12.rc1 (affected, RubyGems); 4.1.13 (affected, RubyGems); 4.1.13.rc1 (affected, RubyGems); 4.1.14 (affected, RubyGems); 4.1.14.1 (affected, RubyGems); 4.1.14.2 (affected, RubyGems); 4.1.14.rc1 (affected, RubyGems); 4.1.14.rc2 (affected, RubyGems); 4.1.15 (affected, RubyGems); 4.1.15.rc1 (affected, RubyGems); 4.1.16 (affected, RubyGems); 4.1.16.rc1 (affected, RubyGems); 4.1.2 (affected, RubyGems); 4.1.2.rc1 (affected, RubyGems); 4.1.2.rc2 (affected, RubyGems); 4.1.2.rc3 (affected, RubyGems); 4.1.3 (affected, RubyGems); 4.1.4 (affected, RubyGems); 4.1.5 (affected, RubyGems); 4.1.6 (affected, RubyGems); 4.1.6.rc1 (affected, RubyGems); 4.1.6.rc2 (affected, RubyGems); 4.1.7 (affected, RubyGems); 4.1.7.1 (affected, RubyGems); 4.1.8 (affected, RubyGems); 4.1.9 (affected, RubyGems); 4.1.9.rc1 (affected, RubyGems); 4.2.0 (affected, RubyGems); 4.2.0.beta1 (affected, RubyGems); 4.2.0.beta2 (affected, RubyGems); 4.2.0.beta3 (affected, RubyGems); 4.2.0.beta4 (affected, RubyGems); 4.2.0.rc1 (affected, RubyGems); 4.2.0.rc2 (affected, RubyGems); 4.2.0.rc3 (affected, RubyGems); 4.2.1 (affected, RubyGems); 4.2.1.rc1 (affected, RubyGems); 4.2.1.rc2 (affected, RubyGems); 4.2.1.rc3 (affected, RubyGems); 4.2.1.rc4 (affected, RubyGems); 4.2.10 (affected, RubyGems); 4.2.10.rc1 (affected, RubyGems); 4.2.11 (affected, RubyGems); 4.2.11.1 (affected, RubyGems); 4.2.11.2 (affected, RubyGems); 4.2.11.3 (affected, RubyGems); 4.2.2 (affected, RubyGems); 4.2.3 (affected, RubyGems); 4.2.3.rc1 (affected, RubyGems); 4.2.4 (affected, RubyGems); 4.2.4.rc1 (affected, RubyGems); 4.2.5 (affected, RubyGems); 4.2.5.1 (affected, RubyGems); 4.2.5.2 (affected, RubyGems); 4.2.5.rc1 (affected, RubyGems); 4.2.5.rc2 (affected, RubyGems); 4.2.6 (affected, RubyGems); 4.2.6.rc1 (affected, RubyGems); 4.2.7 (affected, RubyGems); 4.2.7.1 (affected, RubyGems); 4.2.7.rc1 (affected, RubyGems); 4.2.8 (affected, RubyGems); 4.2.8.rc1 (affected, RubyGems); 4.2.9 (affected, RubyGems); 4.2.9.rc1 (affected, RubyGems); 4.2.9.rc2 (affected, RubyGems); 5.0.0 (affected, RubyGems); 5.0.0.1 (affected, RubyGems); 5.0.0.beta1 (affected, RubyGems); 5.0.0.beta1.1 (affected, RubyGems); 5.0.0.beta2 (affected, RubyGems); 5.0.0.beta3 (affected, RubyGems); 5.0.0.beta4 (affected, RubyGems); 5.0.0.racecar1 (affected, RubyGems); 5.0.0.rc1 (affected, RubyGems); 5.0.0.rc2 (affected, RubyGems); 5.0.1 (affected, RubyGems); 5.0.1.rc1 (affected, RubyGems); 5.0.1.rc2 (affected, RubyGems); 5.0.2 (affected, RubyGems); 5.0.2.rc1 (affected, RubyGems); 5.0.3 (affected, RubyGems); 5.0.4 (affected, RubyGems); 5.0.4.rc1 (affected, RubyGems); 5.0.5 (affected, RubyGems); 5.0.5.rc1 (affected, RubyGems); 5.0.5.rc2 (affected, RubyGems); 5.0.6 (affected, RubyGems); 5.0.6.rc1 (affected, RubyGems); 5.0.7 (affected, RubyGems); 5.0.7.1 (affected, RubyGems); 5.0.7.2 (affected, RubyGems); 5.1.0 (affected, RubyGems); 5.1.0.beta1 (affected, RubyGems); 5.1.0.rc1 (affected, RubyGems); 5.1.0.rc2 (affected, RubyGems); 5.1.1 (affected, RubyGems); 5.1.2 (affected, RubyGems); 5.1.2.rc1 (affected, RubyGems); 5.1.3 (affected, RubyGems); 5.1.3.rc1 (affected, RubyGems); 5.1.3.rc2 (affected, RubyGems); 5.1.3.rc3 (affected, RubyGems); 5.1.4 (affected, RubyGems); 5.1.4.rc1 (affected, RubyGems); 5.1.5 (affected, RubyGems); 5.1.5.rc1 (affected, RubyGems); 5.1.6 (affected, RubyGems); 5.1.6.1 (affected, RubyGems); 5.1.6.2 (affected, RubyGems); 5.1.7 (affected, RubyGems); 5.1.7.rc1 (affected, RubyGems); 5.2.0 (affected, RubyGems); 5.2.0.beta1 (affected, RubyGems); 5.2.0.beta2 (affected, RubyGems); 5.2.0.rc1 (affected, RubyGems); 5.2.0.rc2 (affected, RubyGems); 5.2.1 (affected, RubyGems); 5.2.1.1 (affected, RubyGems); 5.2.1.rc1 (affected, RubyGems); 5.2.2 (affected, RubyGems); 5.2.2.1 (affected, RubyGems); 5.2.2.rc1 (affected, RubyGems); 5.2.3 (affected, RubyGems); 5.2.3.rc1 (affected, RubyGems); 5.2.4 (affected, RubyGems); 5.2.4.1 (affected, RubyGems); 5.2.4.2 (affected, RubyGems); 5.2.4.3 (affected, RubyGems); 5.2.4.4 (affected, RubyGems); 5.2.4.5 (affected, RubyGems); 5.2.4.6 (affected, RubyGems); 5.2.4.rc1 (affected, RubyGems); 5.2.5 (affected, RubyGems); 5.2.6 (affected, RubyGems); 5.2.6.1 (affected, RubyGems); 5.2.6.2 (affected, RubyGems); 5.2.6.3 (affected, RubyGems); 5.2.7 (affected, RubyGems); 5.2.7.1 (affected, RubyGems); 5.2.8 (affected, RubyGems); 5.2.8.1 (affected, RubyGems); 6.0.0 (affected, RubyGems); 6.0.0.beta1 (affected, RubyGems); 6.0.0.beta2 (affected, RubyGems); 6.0.0.beta3 (affected, RubyGems); 6.0.0.rc1 (affected, RubyGems); 6.0.0.rc2 (affected, RubyGems); 6.0.1 (affected, RubyGems); 6.0.1.rc1 (affected, RubyGems); 6.0.2 (affected, RubyGems); 6.0.2.1 (affected, RubyGems); 6.0.2.2 (affected, RubyGems); 6.0.2.rc1 (affected, RubyGems); 6.0.2.rc2 (affected, RubyGems); 6.0.3 (affected, RubyGems); 6.0.3.1 (affected, RubyGems); 6.0.3.2 (affected, RubyGems); 6.0.3.3 (affected, RubyGems); 6.0.3.4 (affected, RubyGems); 6.0.3.5 (affected, RubyGems); 6.0.3.6 (affected, RubyGems); 6.0.3.7 (affected, RubyGems); 6.0.3.rc1 (affected, RubyGems); 6.0.4 (affected, RubyGems); 6.0.4.1 (affected, RubyGems); 6.0.4.2 (affected, RubyGems); 6.0.4.3 (affected, RubyGems); 6.0.4.4 (affected, RubyGems); 6.0.4.5 (affected, RubyGems); 6.0.4.6 (affected, RubyGems); 6.0.4.7 (affected, RubyGems); 6.0.4.8 (affected, RubyGems); 6.0.5 (affected, RubyGems); 6.0.5.1 (affected, RubyGems); 6.0.6 (affected, RubyGems); 6.0.6.1 (affected, RubyGems); 6.1.0 (affected, RubyGems); 6.1.0.rc1 (affected, RubyGems); 6.1.0.rc2 (affected, RubyGems); 6.1.1 (affected, RubyGems); 6.1.2 (affected, RubyGems); 6.1.2.1 (affected, RubyGems); 6.1.3 (affected, RubyGems); 6.1.3.1 (affected, RubyGems); 6.1.3.2 (affected, RubyGems); 6.1.4 (affected, RubyGems); 6.1.4.1 (affected, RubyGems); 6.1.4.2 (affected, RubyGems); 6.1.4.3 (affected, RubyGems); 6.1.4.4 (affected, RubyGems); 6.1.4.5 (affected, RubyGems); 6.1.4.6 (affected, RubyGems); 6.1.4.7 (affected, RubyGems); 6.1.5 (affected, RubyGems); 6.1.5.1 (affected, RubyGems); 6.1.6 (affected, RubyGems); 6.1.6.1 (affected, RubyGems); 6.1.7 (affected, RubyGems); 6.1.7.1 (affected, RubyGems); 6.1.7.10 (affected, RubyGems); 6.1.7.2 (affected, RubyGems); 6.1.7.3 (affected, RubyGems); 6.1.7.4 (affected, RubyGems); 6.1.7.5 (affected, RubyGems); 6.1.7.6 (affected, RubyGems); 6.1.7.7 (affected, RubyGems); 6.1.7.8 (affected, RubyGems); 6.1.7.9 (affected, RubyGems); 7.0.0 (affected, RubyGems); 7.0.0.alpha1 (affected, RubyGems); 7.0.0.alpha2 (affected, RubyGems); 7.0.0.rc1 (affected, RubyGems); 7.0.0.rc2 (affected, RubyGems); 7.0.0.rc3 (affected, RubyGems); 7.0.1 (affected, RubyGems); 7.0.10 (affected, RubyGems); 7.0.2 (affected, RubyGems); 7.0.2.1 (affected, RubyGems); 7.0.2.2 (affected, RubyGems); 7.0.2.3 (affected, RubyGems); 7.0.2.4 (affected, RubyGems); 7.0.3 (affected, RubyGems); 7.0.3.1 (affected, RubyGems); 7.0.4 (affected, RubyGems); 7.0.4.1 (affected, RubyGems); 7.0.4.2 (affected, RubyGems); 7.0.4.3 (affected, RubyGems); 7.0.5 (affected, RubyGems); 7.0.5.1 (affected, RubyGems); 7.0.6 (affected, RubyGems); 7.0.7 (affected, RubyGems); 7.0.7.1 (affected, RubyGems); 7.0.7.2 (affected, RubyGems); 7.0.8 (affected, RubyGems); 7.0.8.1 (affected, RubyGems); 7.0.8.2 (affected, RubyGems); 7.0.8.3 (affected, RubyGems); 7.0.8.4 (affected, RubyGems); 7.0.8.5 (affected, RubyGems); 7.0.8.6 (affected, RubyGems); 7.0.8.7 (affected, RubyGems); 7.1.0 (affected, RubyGems); 7.1.0.beta1 (affected, RubyGems); 7.1.0.rc1 (affected, RubyGems); 7.1.0.rc2 (affected, RubyGems); 7.1.1 (affected, RubyGems); 7.1.2 (affected, RubyGems); 7.1.3 (affected, RubyGems); 7.1.3.1 (affected, RubyGems); 7.1.3.2 (affected, RubyGems); 7.1.3.3 (affected, RubyGems); 7.1.3.4 (affected, RubyGems); 7.1.4 (affected, RubyGems); 7.1.4.1 (affected, RubyGems); 7.1.4.2 (affected, RubyGems); 7.1.5 (affected, RubyGems); 7.1.5.1 (affected, RubyGems); 7.1.5.2 (affected, RubyGems); 7.1.6 (affected, RubyGems); 7.2.0 (affected, RubyGems); 7.2.0.beta1 (affected, RubyGems); 7.2.0.beta2 (affected, RubyGems); 7.2.0.beta3 (affected, RubyGems); 7.2.0.rc1 (affected, RubyGems); 7.2.1 (affected, RubyGems); 7.2.1.1 (affected, RubyGems); 7.2.1.2 (affected, RubyGems); 7.2.2 (affected, RubyGems); 7.2.2.1 (affected, RubyGems); 7.2.2.2 (affected, RubyGems); 7.2.3 (affected, RubyGems); 7.2.3.1 (affected, RubyGems); 7.2.3.2 (affected, RubyGems); 7.2.4 (affected, RubyGems); 8.0.0 (affected, RubyGems); 8.0.0.1 (affected, RubyGems); 8.0.0.beta1 (affected, RubyGems); 8.0.0.rc1 (affected, RubyGems); 8.0.0.rc2 (affected, RubyGems); 8.0.1 (affected, RubyGems); 8.0.2 (affected, RubyGems); 8.0.2.1 (affected, RubyGems); 8.0.3 (affected, RubyGems); 8.0.4 (affected, RubyGems); 8.0.4.1 (affected, RubyGems); 8.0.5 (affected, RubyGems); 8.0.5.1 (affected, RubyGems); Ecosystem version events: introduced 0; fixed 8.0.5.2. Source: OSV GHSA-x6mj-8jx9-qhqv

## Severity and prioritization

- CVSS 3.1: 6.8 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N; source: CNA: GitHub_M

- CVSS 3.1: 6.8 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.41% as of 2026-11-13; percentile 36.29%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-200

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/rails/rails/security/advisories/GHSA-x6mj-8jx9-qhqv (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/rails/rails/commit/0e6cf8faa89caf4c64311d35ca2bc88c1458d4e3 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/rails/rails/commit/849a6c30eacbb6ca4722132f43c4333a93188556 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/rails/rails/releases/tag/v8.0.5.2 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/rails/rails/releases/tag/v8.1.4.1 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/rails/rails/commit/0e6cf8faa89caf4c64311d35ca2bc88c1458d4e3 (security-advisories@github.com)

- https://github.com/rails/rails/commit/849a6c30eacbb6ca4722132f43c4333a93188556 (security-advisories@github.com)

- https://github.com/rails/rails/releases/tag/v8.0.5.2 (security-advisories@github.com)

- https://github.com/rails/rails/releases/tag/v8.1.4.1 (security-advisories@github.com)

- https://github.com/rails/rails/security/advisories/GHSA-x6mj-8jx9-qhqv (security-advisories@github.com)

- https://github.com/rails/rails/security/advisories/GHSA-x6mj-8jx9-qhqv (GitHub Security Advisories; advisory)

- https://github.com/advisories/GHSA-x6mj-8jx9-qhqv (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-x6mj-8jx9-qhqv (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-126077; retrieved 2026-11-14; source updated 2026-11-14

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126077; retrieved 2026-11-13; source updated 2026-11-12

- GitHub Security Advisories: https://github.com/rails/rails/security/advisories/GHSA-x6mj-8jx9-qhqv; retrieved 2026-11-13; source updated 2026-11-10

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-x6mj-8jx9-qhqv; retrieved 2026-11-14; source updated 2026-11-13

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-126077; retrieved 2026-11-14; source updated Not reported

Revision: 362d265a591ad687ab838931c710e1977149525ee1196e10a98e0ab69ce8a18e

Canonical: https://y2.dev/cve/CVE-2026-126077

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.