CVE-2026-3256

HTTP::Session versions before 0.54 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.

• CWE-338
• CWE-340

• https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/MD5.pmProduct
• https://metacpan.org/release/KTAT/http-session-0.53/source/lib/HTTP/Session/ID/SHA1.pmProduct
• https://metacpan.org/release/TOKUHIROM/http-session-0.54/changes
• https://security.metacpan.org/docs/guides/random-data-for-security.htmlThird Party Advisory
• http://www.openwall.com/lists/oss-security/2026/03/28/5Mailing List, Third Party Advisory

Published

Mar 28, 2026

Last Modified

Jun 29, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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