🛡️ CVE-2025-40931
🔴 CVSS 9.1 — Critical ✅ No Known Exploit CWE-338 NVD
9.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id. Apache::Session::Generate::MD5 generates session ids insecurely. The default session id generator returns a MD5 hash seeded with the built-in rand() function, the 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. Predicable session ids could allow an attacker to gain access to systems. Note that the libapache-session-perl package in some Debian-based Linux distributions may be patched to use Crypt::URandom.

Details

Severity CRITICAL
CVSS Score 9.1
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE CWE-338
Public Exploit ✅ No
Source NVD
Published 2026-03-05
Updated 2026-06-02
Modified 2026-04-12
Fix URL N/A

Affected Packages

Software From version Fixed in
apache\ — 1.94

References

Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2026/03/05/3

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