CVE-2026-3256 in KTAT HTTP::Session
Summary
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.
Responsible
CPANSec
Reservation
02/26/2026
Disclosure
03/28/2026
Entries
| Published | Base | Temp | Vulnerability | CWE | Prod | Exp | Cou | EPSS | CTI | CVE |
|---|---|---|---|---|---|---|---|---|---|---|
| 03/28/2026 | 3.7 | 3.7 | KTAT HTTP::Session Session ID SHA1 generation of predictable numbers or identifiers | 340 | Unknown | Not defined | Not defined | 0.00006 | 3.11 | CVE-2026-3256 |