Critical severity9.8NVD Advisory· Published Mar 28, 2026· Updated Apr 1, 2026
CVE-2026-3256
CVE-2026-3256
Description
HTTP::Session versions through 0.53 for Perl defaults to using insecurely generated session ids.
HTTP::Session defaults to using HTTP::Session::ID::SHA1 to generate session ids using a SHA-1 hash seeded with the built-in rand function, the high resolution 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.
The distribution includes HTTP::session::ID::MD5 which contains a similar flaw, but uses the MD5 hash instead.
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Affected products
2- Range: <=0.53
Patches
Vulnerability mechanics
References
4- www.openwall.com/lists/oss-security/2026/03/28/5nvdMailing ListThird Party Advisory
- security.metacpan.org/docs/guides/random-data-for-security.htmlnvdThird Party Advisory
- metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pmnvdProduct
- metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pmnvdProduct
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