CVE-2026-1184 PUBLISHED

Deserialization of Untrusted Data in GitLab

Assigner: GitLab
Reserved: 19.01.2026 Published: 14.05.2026 Updated: 14.05.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	GitLab
Product	GitLab
Versions	Default: unaffected affected from 11.9 to 18.9.7 (excl.) affected from 18.10 to 18.10.6 (excl.) affected from 18.11 to 18.11.3 (excl.)

Solutions

Upgrade to versions 18.9.7, 18.10.6, 18.11.3 or above.

Credits

Thanks [a92847865](https://hackerone.com/a92847865) for reporting this vulnerability through our HackerOne bug bounty program finder

References

Problem Types

CWE-502: Deserialization of Untrusted Data CWE