CVE-2025-12983

EUVD-2025-197698
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3.5 LOW
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L
GitLabCNA
3.5 LOW
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 6%
Affected Products (NVD)
VendorProductVersion
gitlabgitlab
16.9.0 ≤
𝑥
< 18.3.6
gitlabgitlab
16.9.0 ≤
𝑥
< 18.3.6
gitlabgitlab
18.4.0 ≤
𝑥
< 18.4.4
gitlabgitlab
18.4.0 ≤
𝑥
< 18.4.4
gitlabgitlab
18.5.0 ≤
𝑥
< 18.5.2
gitlabgitlab
18.5.0 ≤
𝑥
< 18.5.2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
gitlab
sid
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
gitlab
jammy
dne
noble
dne
plucky
dne
questing
dne
xenial
ignored
Common Weakness Enumeration
References
https://about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/296257
https://hackerone.com/reports/3419588