CVE-2026-8503

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.

Affected products

Apache::Session::Generate::Sha256, Apache::Session::Browseable, Apache, Libapache-Session-Browseable-Perl

Guimard apache\:\:session\:\:generate\:\:sha256

< 1.3.19

Fix

Available

CVSS 3.1

6.5 MEDIUM

EPSS

0.2% (16th percentile)

Weakness

CWE-338, CWE-340

NVD status

Analyzed

Published

2026-05-15

Attack patterns

CAPEC-115, CAPEC-102

No exploit for CVE-2026-8503 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.