What is CVE-2026-56016?

CVE-2026-56016 is a medium-severity vulnerability in Markstos Cgi::session::id::md5, classified under Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). CVSS score: 5.9/10. Published 2026-07-01.

How severe is CVE-2026-56016?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Markstos Cgi::session::id::md5

CVE-2026-56016

CGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sources. The generate_id method builds the session id from a MD5 digest of the process id, the epoch time, and the built-in rand() funct…

EPSS: 0.002 (8.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Markstos Cgi::session::id::md5 — versions 0

Weakness classification (CWE)

References

9b29abf9-4ab0-4765-b253-1875cd9b441e (release-notes)
9b29abf9-4ab0-4765-b253-1875cd9b441e (related)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-56016?: CVE-2026-56016 is a medium-severity vulnerability in Markstos Cgi::session::id::md5, classified under Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG). CVSS score: 5.9/10. Published 2026-07-01.
How severe is CVE-2026-56016?: Medium severity. CVSS v3 base score is 5.9 out of 10.