CVE-2023-3909 | BDVDB-2026-216065 Detail

GitLabGitLab

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact low. Attack vector: network.

Weaknesses#

CWE-1333 Inefficient Regular Expression Complexity

References#

Exploit#

https://hackerone.com/reports/2050269

History#

Version 12023-11-06Record published in the CVE List.
Version 22025-11-20Most recent update recorded in the CVE List.

Published

Published: 2023-11-06
Last modified: 2025-11-20

Vendor information

Vendor: GitLab
Product: GitLab

All GitLab vulnerabilities

Score

4.3 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 54.4.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 12.3 and < 16.3.6
Fixed
16.3.6
Vulnerable
>= 16.4 and < 16.4.2
Fixed
16.4.2
Vulnerable
>= 16.5 and < 16.5.1
Fixed
16.5.1

Scoring System

CVSS v4.0

Not available

CVSS v3.1

4.3 Medium

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	Low

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).