CVE-2025-40931

Apache::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.

• CWE-338
• CWE-340

• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930659
• https://github.com/chorny/Apache-Session/issues/4Issue Tracking
• https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/1633
• https://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm#L27Product
• https://metacpan.org/pod/Apache::Session::Generate::Random
• https://rt.cpan.org/Ticket/Display.html?id=173631Third Party Advisory
• https://salsa.debian.org/perl-team/modules/packages/libapache-session-perl/-/commit/bdabd71c2f91b18526e31a9dc52b4c17b3d246b7#898a4b8b00022df1b8689910b67707f3e738d180
• https://security.metacpan.org/docs/guides/random-data-for-security.htmlMailing List, Third Party Advisory
• https://www.openwall.com/lists/oss-security/2019/06/15/1
• http://www.openwall.com/lists/oss-security/2026/03/05/3Mailing List, Third Party Advisory

Published

Mar 5, 2026

Last Modified

Jun 17, 2026

Status

Modified