CVE-2026-1184

Deserialization of Untrusted Data in GitLab

GitLab has remediated an issue in GitLab EE affecting all versions from 11.9 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to cause denial of service by uploading a specially crafted file due to improper validation.

Affected

GitLab

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 GITLAB

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.33% chance of exploitation in the next 30 days, 25th percentile

Published

2026-05-14

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3515842

Security advisories

• https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released

References

• CVE Record
• NVD entry