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CVE-2026-126085

Active Storage: Possible circumvention of file size limits in Active Storage direct uploads to Google Cloud Storage

publishedCWE-602

Active Storage makes it simple to upload and reference files in cloud services and attach those files to Active Record objects. Prior to 8.1.4.1 and 8.0.5.2, ActiveStorage::Service::GCSService#url_for_direct_upload does not bind the declared content length into the signed direct-upload URL, and #headers_for_direct_upload returns no length constraint, so the URL authorizes an upload body of any size. A direct-upload client could store a file larger than the byte_size it declared, and the resulting blob keeps the declared size, possibly bypassing application file size validations and quotas. This is the weakness that CVE-2020-8162 fixed in the S3 service. Applications that store files in Google Cloud Storage and accept direct uploads are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.

Technical severity5.3 mediumCVSS 3.1 · CNA: GitHub_M
Published2026-11-10Source updated 2026-11-14
Collected2026-11-144 attributed sources

Fixes and workarounds

Fix

activestorage (RubyGems): OSV reports a fixed version 8.1.4.1. Check the advisory for supported release branches.

Source: OSV GHSA-hfr4-8rjc-97m2

Fix

activestorage (RubyGems): OSV reports a fixed version 8.0.5.2. Check the advisory for supported release branches.

Source: OSV GHSA-hfr4-8rjc-97m2

Affected products and versions

ProductVersionsAuthority
rails
rails 		>= 8.1, < 8.1.4.1 (affected)
< 8.0.5.2 (affected) 		CNA: GitHub_M
activestorage

activestorage
RubyGems 		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 events (ECOSYSTEM) 
[
  {
    "introduced": "8.1.0.beta1"
  },
  {
    "fixed": "8.1.4.1"
  }
]

Other versions: unaffected 		OSV GHSA-hfr4-8rjc-97m2
activestorage

activestorage
RubyGems 		0.1 (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 events (ECOSYSTEM) 
[
  {
    "introduced": "0"
  },
  {
    "fixed": "8.0.5.2"
  }
]

Other versions: unaffected 		OSV GHSA-hfr4-8rjc-97m2

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
3.1 / 5.3
medium		 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NCNA: GitHub_M
3.1 / 5.3
medium		 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NNVD: [email protected]

Exploit evidence

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

References

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