High severity7.3NVD Advisory· Published Jul 16, 2025· Updated Apr 15, 2026
CVE-2025-40923
CVE-2025-40923
Description
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.
Patches
317a30c10a8af1fbfbb355e3435feb7bc2a71Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
5- www.openwall.com/lists/oss-security/2025/07/16/4nvd
- github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patchnvd
- github.com/plack/Plack-Middleware-Session/pull/52nvd
- metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pmnvd
- security.metacpan.org/docs/guides/random-data-for-security.htmlnvd
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