CVE-2026-63077
JetBrains TeamCity Deserialization of Untrusted Data Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-08-05. Federal due date: 2026-08-08.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Impact
JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| JetBrains | TeamCity | Version 0 <2026.1.3, 2025.11.7 |
| Jetbrains | Teamcity | before 2025.11.7 from 2026.1 before 2026.1.3 |