What is CVE-2023-3909?

CVE-2023-3909 is a medium-severity vulnerability in Gitlab, classified under Inefficient Regular Expression Complexity. CVSS score: 4.3/10. Published 2023-11-06.

How severe is CVE-2023-3909?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Gitlab

CVE-2023-3909

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.3 before 16.3.6, all versions starting from 16.4 before 16.4.2, all versions starting from 16.5 before 16.5.1. A Regular Expression Denial of Service was possible by adding a large string in timeout input in gitlab-ci.yml file.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

EPSS: 0.006 (45.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Affected products

Gitlab — versions 16.4, 16.5.0, 16.5

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

cve@gitlab.com (issue-tracking, permissions-required, Broken Link)
cve@gitlab.com (Permissions Required, technical-description, permissions-required, exploit)

Frequently asked questions

What is CVE-2023-3909?: CVE-2023-3909 is a medium-severity vulnerability in Gitlab, classified under Inefficient Regular Expression Complexity. CVSS score: 4.3/10. Published 2023-11-06.
How severe is CVE-2023-3909?: Medium severity. CVSS v3 base score is 4.3 out of 10.