CVE-2026-9692: Mojolicious::Sessions::Storable versions through 0.05 for Perl generate session ids insecurely

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-18 · updated 2026-10-26
Weakness: CWE-338

Description

Mojolicious::Sessions::Storable versions through 0.05 for Perl generate session ids insecurely. The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, the heap address of an anonymous hash, and the PID. These are predictable or low-entropy sources that are unsuitable for security purposes.

Affected products

HAYAJO Mojolicious::Sessions::Storable: through 0.05

References

https://metacpan.org/release/HAYAJO/Mojolicious-Plugin-SessionStore-0.05/source/lib/Mojolicious/Sessions/Storable.pm#L11-15
https://security.metacpan.org/docs/guides/random-data-for-security.html
https://security.metacpan.org/patches/M/Mojolicious-Plugin-SessionStore/0.05/CVE-2026-9692-r1.patch
https://www.cve.org/CVERecord?id=CVE-2025-40923

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