OS Command Injection in TeamCity - CVE-2026-100254
Published: October 2, 2026
Vulnerability identifier: #VU153134
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-2026-100254
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute commands on Windows servers.
The vulnerability exists due to improper neutralization of CRLF sequences in Pipeline Git connection settings when configuring connection settings with CRLF sequences. A remote user can inject CRLF sequences into Pipeline Git connection settings to execute commands on Windows servers.
Affected software
TeamCity
How to mitigate CVE-2026-100254
Install security update from vendor's website.
TeamCity - addressed in versions 2025.11.8, 2026.1.4, 2026.2