CVE-2026-3255
Description
HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.
The HTTP::Session2 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.
HTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.
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Affected products
4- TOKUHIROM/HTTP::Session2v5Range: 0
- Range: <1.12
- Range: <1.12
Patches
Vulnerability mechanics
References
5- github.com/tokuhirom/HTTP-Session2/commit/9cfde4d7e0965172aef5dcfa3b03bb48df93e636.patchnvdPatch
- www.openwall.com/lists/oss-security/2026/02/27/12nvdMailing ListThird Party Advisory
- metacpan.org/release/TOKUHIROM/HTTP-Session2-1.01/source/lib/HTTP/Session2/ServerStore.pmnvdIssue Tracking
- metacpan.org/release/TOKUHIROM/HTTP-Session2-1.11/source/lib/HTTP/Session2/Random.pmnvdIssue Tracking
- metacpan.org/release/TOKUHIROM/HTTP-Session2-1.12/changesnvdRelease Notes
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