CVE-2026-8503CWE-338CWE-340

Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids

Medium · published May 15, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
32.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00392 · 32.1th percentile
Weaknesses
CWE-338 · Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG); CWE-340 · Generation of Predictable Numbers or Identifiers
Published
2026-05-15T11:06Z
EPSS history
Timeline
  • 15 MAY 11:06Z
    Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids
    cvelistv5