What’s Vulnerable › Vulnerabilities

CVE-2025-40924: Catalyst::Plugin::Session before version 0.44 for Perl generates session ids insecurely

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-17 · updated 2026-06-17
• Weakness: CWE-338

Description

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

How to fix

Upgrade to a fixed version: HAARG Catalyst::Plugin::Session 0.44. Check the vendor advisory for mitigations.

References

• https://github.com/perl-catalyst/Catalyst-Plugin-Session/commit/c0e2b4ab1e42ebce1008286db8c571b6ee98c22c.patch
• https://github.com/perl-catalyst/Catalyst-Plugin-Session/pull/5
• https://metacpan.org/release/HAARG/Catalyst-Plugin-Session-0.43/source/lib/Catalyst/Plugin/Session.pm#L632

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