Deserialization of Untrusted Data in GitLab Enterprise Edition - CVE-2026-87719
Published: September 11, 2026 / Updated: September 11, 2026
Vulnerability identifier: #VU148977
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-87719
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data in GraphQL subscription serializer. A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
GitLab Enterprise Edition
How to mitigate CVE-2026-87719
Install updates from vendor's website.
GitLab Enterprise Edition - addressed in versions 19.1.8, 19.2.6, 19.3.2