Deserialization of Untrusted Data in TeamCity - CVE-2026-63077
Published: July 27, 2026 / Updated: July 31, 2026
Vulnerability identifier: #VU140627
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-63077
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
TeamCity
TeamCity
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to deserialization of untrusted data in the agent polling protocol when processing agent polling requests. A remote attacker can send specially crafted protocol data to execute arbitrary code.
How to mitigate CVE-2026-63077
Install security update from vendor's website.