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CVE-2021-39940

MEDIUM
6.5
CVSS Score
Published: December 13, 2021 at 03:47 PM UTC
Updated: June 17, 2026 at 04:04 AM UTC
1 product affected across 1 vendorGitLab

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Severity
MEDIUM6.5
Exploit prediction
EPSS 2%

Description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.2 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. GitLab Maven Package registry is vulnerable to a regular expression denial of service when a specifically crafted string is sent.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitLab· GitLabmaven
95%
v < 14.3.6v < 14.4.4v < 14.5.213.2.0 ≤ v < 14.3.614.4.0 ≤ v < 14.4.414.5.0 ≤ v < 14.5.2
Affected range stops below 14.3.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.4.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.5.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39940.json
x_refsource_MISCBroken Link
Source: [email protected]
https://gitlab.com/gitlab-org/gitlab/-/issues/263116
x_refsource_MISCPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/997961

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-1333

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