CVE-2025-40931
Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id
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. Note that the libapache-session-perl package in some Debian-based Linux distributions may be patched to use Crypt::URandom.
INFO
Published Date :
March 5, 2026, 2:16 a.m.
Last Modified :
April 12, 2026, 6:16 p.m.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Apache::Session::Generate::MD5 to a secure version.
- Ensure session IDs are generated using a cryptographically secure method.
- Avoid using predictable information for session ID seeding.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-40931.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-40931 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-40931
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-40931 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-40931 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Apr. 12, 2026
Action Type Old Value New Value Changed 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. 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. Added Reference https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930659 Added Reference https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/1633 Added Reference https://metacpan.org/pod/Apache::Session::Generate::Random Added Reference https://salsa.debian.org/perl-team/modules/packages/libapache-session-perl/-/commit/bdabd71c2f91b18526e31a9dc52b4c17b3d246b7#898a4b8b00022df1b8689910b67707f3e738d180 Added Reference https://www.openwall.com/lists/oss-security/2019/06/15/1 -
Initial Analysis by [email protected]
Mar. 09, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:chorny:apache::session::generate::md5:*:*:*:*:*:perl:*:* versions up to (including) 1.94 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/03/05/3 Types: Mailing List, Third Party Advisory Added Reference Type CPANSec: https://github.com/chorny/Apache-Session/issues/4 Types: Issue Tracking Added Reference Type CPANSec: https://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm#L27 Types: Product Added Reference Type CPANSec: https://rt.cpan.org/Ticket/Display.html?id=173631 Types: Third Party Advisory Added Reference Type CPANSec: https://security.metacpan.org/docs/guides/random-data-for-security.html Types: Mailing List, Third Party Advisory -
CVE Modified by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Mar. 06, 2026
Action Type Old Value New Value Added Reference https://github.com/chorny/Apache-Session/issues/4 Added Reference https://rt.cpan.org/Ticket/Display.html?id=173631 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 05, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Mar. 05, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/03/05/3 -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Mar. 05, 2026
Action Type Old Value New Value Added 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. Added CWE CWE-338 Added CWE CWE-340 Added Reference https://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm#L27 Added Reference https://security.metacpan.org/docs/guides/random-data-for-security.html