CVE entry · CVE-2026-63077
CVE-2026-63077: JetBrains TeamCity Deserialization of Untrusted Data Vulnerability
JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol.
- Actively exploited: added to CISA’s KEV catalog on August 5, 2026.
- Used by ransomware, according to CISA.
- Remediation deadline for US federal agencies: August 8, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes JetBrains TeamCity, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (blog.jetbrains.com)
- Vendor advisory or reference cited by CISA (www.jetbrains.com)
- NVD entry (NIST)
- CISA KEV catalog
Other JetBrains vulnerabilities
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CVE-2024-27199Used by ransomwareJetBrains TeamCity Relative Path Traversal Vulnerability