ACTIVELY EXPLOITED
CVE-2026-63077: JetBrains TeamCity Deserialization of Untrusted Data Vulnerability
| Vendor | JetBrains |
|---|---|
| Product | TeamCity |
| Actively exploited | Yes |
| Added to CISA KEV | 5 Aug 2026 |
| CISA federal deadline | 8 Aug 2026 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-502 |
Required action (CISA's text)
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.
Description (NVD)
JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.
SOURCES
Other JetBrains flaws
- CVE-2024-27199: JetBrains TeamCity Relative Path Traversal Vulnerability
- CVE-2024-27198: JetBrains TeamCity Authentication Bypass Vulnerability
- CVE-2023-42793: JetBrains TeamCity Authentication Bypass Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.