CVE-2026-3256
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk41th percentile - higher than 41% of all known CVEs
Summary
The HTTP::Session library for Perl versions before 0.54 defaults to generating insecure session IDs. It uses SHA-1 seeded with the rand function, epoch time, and PID, which is predictable.
Risk Assessment
An attacker can predict or brute-force session IDs, leading to session hijacking and unauthorized access to sensitive data or application functionality.
Recommendation
Immediately upgrade HTTP::Session to version 0.54 or later, which includes fixed session ID generation.
Original NVD description (English source)
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.