Vulnerability in Rack Rack-session

CVE-2025-46336

Rack::Session is a session management implementation for Rack. In versions starting from 2.0.0 to before 2.1.1, when using the Rack::Session::Pool middleware, and provided the attacker can acquire a session cookie (already a major issue)…

Vulnerability class: Race Condition

EPSS: 0.001 (29.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-46336?
CVE-2025-46336 is a medium-severity vulnerability in Rack Rack-session, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.2/10. Published 2025-05-08.
How severe is CVE-2025-46336?
Medium severity. CVSS v3 base score is 4.2 out of 10.