CVE-2025-40923: high-severity vulnerability in MIYAGAWA Plack::Middleware::Session
Plack-Middleware-Session before version 0.35 for Perl generates session ids insecurely
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.3epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected products
MIYAGAWA · Plack::Middleware::SessionRelated CVEs — MIYAGAWA Plack::Middleware::Session
In the same product, most dangerous first.
References
https://github.com/plack/Plack-Middleware-Session/commit/1fbfbb355e34e7f4b3906f66cf958cedadd2b9be.patchhttps://github.com/plack/Plack-Middleware-Session/pull/52https://metacpan.org/release/MIYAGAWA/Plack-Middleware-Session-0.34/source/lib/Plack/Session/State.pm#L22https://security.metacpan.org/docs/guides/random-data-for-security.htmlhttp://www.openwall.com/lists/oss-security/2025/07/16/4