Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2025-40931
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-05 02:16:39 UTC
Updated2026-04-12 18:16:38 UTC
DescriptionApache::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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

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

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
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Chorny Apache \ session\ \ generate\

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CHORNY ApacheSessionGenerateMD5 affected 1.94 custom Not specified

References

ReferenceSourceLinkTags
salsa.debian.org/perl-team/modules/packages/libapache-session-perl/-/commit/bd... 9b29abf9-4ab0-4765-b253-1875cd9b441e salsa.debian.org
gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/1633 9b29abf9-4ab0-4765-b253-1875cd9b441e gitlab.ow2.org
metacpan.org/pod/Apache::Session::Generate::Random 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.openwall.com/lists/oss-security/2019/06/15/1 9b29abf9-4ab0-4765-b253-1875cd9b441e www.openwall.com
github.com/chorny/Apache-Session/issues/4 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com Issue Tracking
security.metacpan.org/docs/guides/random-data-for-security.html 9b29abf9-4ab0-4765-b253-1875cd9b441e security.metacpan.org Mailing List, Third Party Advisory
metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Product
www.openwall.com/lists/oss-security/2026/03/05/3 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
bugs.debian.org/cgi-bin/bugreport.cgi 9b29abf9-4ab0-4765-b253-1875cd9b441e bugs.debian.org
rt.cpan.org/Ticket/Display.html 9b29abf9-4ab0-4765-b253-1875cd9b441e rt.cpan.org Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2017-10-06T00:00:00.000ZIssue created in the GitHub repository for Apache-Session identifying poor entropy.
CNA2019-06-15T00:00:00.000ZReport posted to the Open Source Security mailing list.
CNA2019-06-17T00:00:00.000ZDebian bug 930659 for libapache-session-perl poor source of entropy for session id generation.
CNA2019-06-20T00:00:00.000ZPatch to use Crypt::URandom created by the Debian Perl Group.
CNA2025-09-04T00:00:00.000ZIssue reported to CPANSec.
CNA2026-03-05T00:00:00.000ZCVE disclosed by CPANSec.

Solutions

CNA: Consider alternate solutions like https://metacpan.org/pod/Apache::Session::Generate::Random

Workarounds

CNA: Apply the patch from the Debian Perl Group that uses Crypt::URandom.

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