CVE Catalog

CVE-2026-8503

MediumCVSS 6.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.24%

15th percentile - higher than 15% of all known CVEs

Summary

Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session IDs. The default generator returns a SHA-256 hash of the built-in rand() function, epoch time, and PID, which are predictable, low-entropy sources, potentially allowing an attacker to gain access to systems.

Risk Assessment

Predictable session IDs may allow an attacker to hijack sessions and gain unauthorized access to systems. This issue is similar to CVE-2025-40931.

Recommendation

Update Apache::Session::Generate::SHA256 to version 1.3.19 or later. Ensure Crypt::URandom is available to avoid fallback to the insecure generation method.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS