CVE-2025-40923

Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely. The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. 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.

The following products are affected by CVE-2025-40923 vulnerability.

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Here, you will find a curated list of external links that provide in-depth information to CVE-2025-40923.

URL	Resource
https://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patch
https://github.com/plack/Plack-Middleware-Session/pull/52
https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22
https://security.metacpan.org/docs/guides/random-data-for-security.html