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Message-ID: <cb29954e-6432-4cbb-8851-45a8c14d4263@cpansec.org>
Date: Mon, 13 Apr 2026 08:00:24 +0100
From: Robert Rothenberg <rrwo@...nsec.org>
To: cve-announce@...urity.metacpan.org, oss-security@...ts.openwall.com
Subject: CVE-2026-5085: Solstice::Session versions through 1440 for Perl
generates session ids insecurely
========================================================================
CVE-2026-5085 CPAN Security Group
========================================================================
CVE ID: CVE-2026-5085
Distribution: Solstice
Versions: through 1440
MetaCPAN: https://metacpan.org/dist/Solstice
Solstice::Session versions through 1440 for Perl generates session ids
insecurely
Description
-----------
Solstice::Session versions through 1440 for Perl generates session ids
insecurely.
The _generateSessionID method returns an MD5 digest seeded by the epoch
time, a random hash reference, a call to the built-in rand() function
and the process id.
The same method is used in the _generateID method in
Solstice::Subsession, which is part of the same distribution.
The epoch time may be guessed, if it is not leaked in the HTTP Date
header. Stringified hash refences will contain predictable content. The
built-in rand() function is seeded by 16-bits and is unsuitable for
security purposes. The process id comes from a small set of numbers.
Predictable session ids could allow an attacker to gain access to
systems.
Problem types
-------------
- CWE-340 Generation of Predictable Numbers or Identifiers
- CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator
References
----------
https://metacpan.org/dist/Solstice/source/lib/Solstice/Session.pm#L481
https://metacpan.org/dist/Solstice/source/lib/Solstice/Subsession.pm#L105
https://security.metacpan.org/docs/guides/random-data-for-security.html
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