CVE-2025-40931

CRITICAL

9.1

Description

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.

CVE Details

CVSS v3.1 Score9.1

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/5/2026

Last Modified3/9/2026

Sourcenvd

Honeypot Sightings0

Affected Products

chorny:apache\

Weaknesses (CWE)

CWE-338CWE-340

References

https://github.com/chorny/Apache-Session/issues/4(9b29abf9-4ab0-4765-b253-1875cd9b441e)

https://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm#L27(9b29abf9-4ab0-4765-b253-1875cd9b441e)

https://rt.cpan.org/Ticket/Display.html?id=173631(9b29abf9-4ab0-4765-b253-1875cd9b441e)

https://security.metacpan.org/docs/guides/random-data-for-security.html(9b29abf9-4ab0-4765-b253-1875cd9b441e)

http://www.openwall.com/lists/oss-security/2026/03/05/3(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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