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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776eec3dd8bf4748b15fa827dbd0.patch	Patch
https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changes	Release Notes
https://metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMARD/Apache-Session-Browseable-1.3.18#lib/Apache/Session/Generate/SHA256.pm	Product
https://www.cve.org/CVERecord?id=CVE-2025-40931	Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2025-40932	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:guimard:apache\:\:session\:\:generate\:\:sha256:*:*:*:*:*:perl:*:*

History

No history.

Information

Published : 2026-05-15 12:17

Updated : 2026-06-17 11:04

NVD link : CVE-2026-8503

Mitre link : CVE-2026-8503

CVE.ORG link : CVE-2026-8503

JSON object : View

Products Affected

guimard

apache\

CWE

CWE-338

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

CWE-340

Generation of Predictable Numbers or Identifiers

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