Description
Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids. Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems. Note that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module. This issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5.
Problem types
CWE-340 Generation of Predictable Numbers or Identifiers
CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator
Product status
Any version before 1.3.19
Timeline
| 2026-05-13: | Issue identified by CPANSec |
| 2026-05-13: | Issue reported to author |
| 2026-05-14: | Version 1.3.19 released |
References
metacpan.org/…ARD/Apache-Session-Browseable-1.3.19/changes
metacpan.org/…iff/GUIMARD/Apache-Session-Browseable-1.3.18
github.com/…cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch
www.cve.org/CVERecord?id=CVE-2025-40931
www.cve.org/CVERecord?id=CVE-2025-40932
