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CVE record · CVE-2026-63077

Deserialization of untrusted data in JetBrains TeamCity

CVSS 9.8 CriticalCriticalIn CISA KEV · ransomwareEPSS 0.95 · 99th percentile

Critical, because:

  • In CISA’s KEV catalogue since 5 Aug 2026: it is known to be exploited.
  • CVSS score 9.8: 9.0 or more.
  • CVSS score 9.8 (7.0 or more) and EPSS 0.95 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: JetBrains) at 27 Jul 2026, 16:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
JetBrains TeamCity
  • affected before 2026.1.3, 2025.11.7 semver
Other versions: unaffected
Identifiers
CVE-2026-63077
CNA
JetBrains
Weakness (CWE)
CWE-502
Tags
Published
27 Jul 2026
Updated
23 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CNA (JetBrains)
  • CISA KEV Listed since 5 Aug 2026: known to be exploited. CISA reports use in ransomware campaigns.
  • EPSS 0.95, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 27 Jul 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.