CVE-2025-40924 Catalyst::Plugin::Session before version 0.44 for Perl generates session ids insecurely
Insecure session ID generation in Catalyst::Plugin::Session allows attackers to predict IDs and potentially hijack user accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40924?
CVE-2025-40924 is a medium-severity vulnerability in HAARG Catalyst::Plugin::Session, published on 17 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-40924?
How do I fix CVE-2025-40924?
Upgrade to a fixed version.
Is CVE-2025-40924 being exploited?
There is no known exploitation of CVE-2025-40924 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-40924, GHSA-32wx-j5gv-pmfp, UBUNTU-CVE-2025-40924.