CVE-2025-40924: Haarg Catalyst::plugin::session

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Catalyst::Plugin::Session before version 0.44 for Perl generates session ids insecurely. The session id is generated from a (usually SHA-1) hash of a simple counter, the epoch time, the built-in rand function, the PID and the current Catalyst context. This information is of low entropy. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Predicable session ids could allow an attacker to gain access to systems.

Affected products

• Haarg Catalyst::plugin::session: from 0.01, before 0.44 (fixed in 0.44)

Published 2025-07-17. Last modified 2026-06-17.