Improper Authentication Affecting ruby4.0-rails-8.0 package, versions <8.0.5-r1
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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- published13 Apr 2026
- disclosed7 Apr 2026
Introduced: 7 Apr 2026
NewCVE-2026-39324 (opens in a new tab)How to fix?
Upgrade Chainguard ruby4.0-rails-8.0 to version 8.0.5-r1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ruby4.0-rails-8.0 package and not the ruby4.0-rails-8.0 package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
Rack::Session is a session management implementation for Rack. From 2.0.0 to before 2.1.2, Rack::Session::Cookie incorrectly handles decryption failures when configured with secrets:. If cookie decryption fails, the implementation falls back to a default decoder instead of rejecting the cookie. This allows an unauthenticated attacker to supply a crafted session cookie that is accepted as valid session data without knowledge of any configured secret. Because this mechanism is used to load session state, an attacker can manipulate session contents and potentially gain unauthorized access. This vulnerability is fixed in 2.1.2.