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Critical severity9.8NVD Advisory· Published Apr 7, 2026· Updated Apr 15, 2026

CVE-2026-39324

CVE-2026-39324

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
rack-sessionRubyGems
>= 2.0.0, < 2.1.22.1.2

Affected products

50

Patches

Vulnerability mechanics

References

4

News mentions

0

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