{"id":"DEBIAN-CVE-2025-40931","details":"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.","modified":"2026-09-01T20:05:52.284447054Z","published":"2026-03-05T02:16:39.960Z","upstream":["CVE-2025-40931"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-40931"}],"affected":[{"package":{"name":"libapache-session-perl","ecosystem":"Debian:12","purl":"pkg:deb/debian/libapache-session-perl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.94-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40931.json"}},{"package":{"name":"libapache-session-perl","ecosystem":"Debian:13","purl":"pkg:deb/debian/libapache-session-perl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.94-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40931.json"}},{"package":{"name":"libapache-session-perl","ecosystem":"Debian:14","purl":"pkg:deb/debian/libapache-session-perl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.94-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40931.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}