CVE-2026-126350
Addressable: Regular Expression Denial of Service in Addressable templates with certain exploded expressions
Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. From 2.3.0 until 2.9.1, URI template expressions using the explode modifier with the slash, dot, semicolon, question-mark, or ampersand operators generate ambiguous regular expressions. When Template#match or Template#extract processes an attacker-controlled URI beginning with the operator's leading character, optional member separators allow catastrophic backtracking and denial of service on MRI Ruby before 3.2 and JRuby. Addressable 2.9.0 incompletely remediated the earlier template issue because its tests did not reach these operator-prefixed paths. URI parsing and Template#expand are unaffected. This issue is fixed in version 2.9.1.
Fixes and workarounds
Fix
addressable (RubyGems): OSV reports a fixed version 2.9.1. Check the advisory for supported release branches.
Source: OSV GHSA-j82w-28jv-3pmjAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| addressable sporkmonger |
>= 2.3.0, < 2.9.1 (affected) | CNA: GitHub_M |
addressableaddressable
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) 2.4.0 (affected, RubyGems) 2.5.0 (affected, RubyGems) 2.5.1 (affected, RubyGems) 2.5.2 (affected, RubyGems) 2.6.0 (affected, RubyGems) 2.7.0 (affected, RubyGems) 2.8.0 (affected, RubyGems) 2.8.1 (affected, RubyGems) 2.8.10 (affected, RubyGems) 2.8.2 (affected, RubyGems) 2.8.3 (affected, RubyGems) 2.8.4 (affected, RubyGems) 2.8.5 (affected, RubyGems) 2.8.6 (affected, RubyGems) 2.8.7 (affected, RubyGems) 2.8.8 (affected, RubyGems) 2.8.9 (affected, RubyGems) 2.9.0 (affected, RubyGems) Ecosystem version events: introduced 2.3.0; fixed 2.9.1 Source events (ECOSYSTEM)Other versions: unaffected |
OSV GHSA-j82w-28jv-3pmj |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.9 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/sporkmonger/addressable/security/advisories/GHSA-j82w-28jv-3pmjCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/sporkmonger/addressable/issues/364CNA: GitHub_M · x_refsource_MISC
- https://github.com/sporkmonger/addressable/commit/26d1e9e8409a861571f9d0029022b6e9b9158b5eCNA: GitHub_M · x_refsource_MISC
- https://github.com/sporkmonger/addressable/releases/tag/addressable-2.9.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/advisories/GHSA-j82w-28jv-3pmjOSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-j82w-28jv-3pmjOSV / GitHub Security Advisories · osv
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.