Client-Side Enforcement of Server-Side Security Affecting rails package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN13-RAILS-22421951
- published11 Nov 2026
- disclosed10 Nov 2026
Introduced: 10 Nov 2026
NewCVE-2026-126085 (opens in a new tab)How to fix?
There is no fixed version for Debian:13 rails.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rails package and not the rails package as distributed by Debian.
See How to fix? for Debian:13 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-126085
- https://github.com/rails/rails/commit/7fe85a72a789eae5ee070ce3ee1dad10a8a5f70c
- https://github.com/rails/rails/commit/e19916cea31cbfb0030b165ae853b741f8dd57a7
- https://github.com/rails/rails/releases/tag/v8.0.5.2
- https://github.com/rails/rails/releases/tag/v8.1.4.1
- https://github.com/rails/rails/security/advisories/GHSA-hfr4-8rjc-97m2