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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-8503
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-15 12:17:09 UTC
Updated2026-05-18 18:23:03 UTC
DescriptionApache::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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.000410000 probability, percentile 0.124460000 (date 2026-05-26)

Problem Types: CWE-338 | CWE-340 | CWE-340 CWE-340 Generation of Predictable Numbers or Identifiers | CWE-338 CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Guimard Apache \ session\ \ generate\

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GUIMARD ApacheSessionGenerateSHA256 affected 1.3.19 custom Not specified

References

ReferenceSourceLinkTags
github.com/LemonLDAPNG/Apache-Session-Browseable/commit/cc915cbbd266776e... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com Patch
www.cve.org/CVERecord 9b29abf9-4ab0-4765-b253-1875cd9b441e www.cve.org Third Party Advisory
metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Release Notes
www.cve.org/CVERecord 9b29abf9-4ab0-4765-b253-1875cd9b441e www.cve.org Third Party Advisory
metacpan.org/release/GUIMARD/Apache-Session-Browseable-1.3.19/diff/GUIMARD... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Product
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-05-13T00:00:00.000ZIssue identified by CPANSec
CNA2026-05-13T00:00:00.000ZIssue reported to author
CNA2026-05-14T00:00:00.000ZVersion 1.3.19 released

Workarounds

CNA: Upgrade to version 1.3.19 or later.

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