CVE-2026-8503

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.

PUBLISHED Reserved 2026-05-13 | Published 2026-05-15 | Updated 2026-05-15 | Assigner CPANSec

Problem types

CWE-340 Generation of Predictable Numbers or Identifiers

CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator

Product status

Timeline

References

metacpan.org/...ARD/Apache-Session-Browseable-1.3.19/changes release-notes

metacpan.org/...iff/GUIMARD/Apache-Session-Browseable-1.3.18

github.com/...cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch patch

www.cve.org/CVERecord?id=CVE-2025-40931 related

www.cve.org/CVERecord?id=CVE-2025-40932 related

cve.org (CVE-2026-8503)

nvd.nist.gov (CVE-2026-8503)

Download JSON