======================================================================== CVE-2026-3255 CPAN Security Group ========================================================================
CVE ID: CVE-2026-3255 Distribution: HTTP-Session2 Versions: before 1.12 MetaCPAN: https://metacpan.org/dist/HTTP-Session2 VCS Repo: https://github.com/tokuhirom/HTTP-Session2 HTTP::Session2 versions before 1.12 for Perl may generate weak session ids using the rand() function 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. Problem types ------------- - CWE-340 Generation of Predictable Numbers or Identifiers - CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator Workarounds ----------- Upgrade to version 1.12 or later. Solutions --------- HTTP::Session2 has been deprecated since version 1.11. Migrate to a different solution. References ---------- https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.11/source/lib/HTTP/Session2/Random.pm#L35 https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.01/source/lib/HTTP/Session2/ServerStore.pm#L68 https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.12/changes https://github.com/tokuhirom/HTTP-Session2/commit/9cfde4d7e0965172aef5dcfa3b03bb48df93e636.patch Timeline -------- - 2014-07-31: version 1.02 HTTP::Session2 released that attempts to use /dev/urandom. - 2026-02-24: version 1.11 HTTP::Session2 deprecated - 2026-02-26: version 1.12 HTTP::Session2 released with a fix with a portable solution.
