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PatchSiren cyber security CVE debrief

CVE-2026-63077 JetBrains CVE debrief

CVE-2026-63077: A critical deserialization of untrusted data vulnerability exists in JetBrains TeamCity. This vulnerability, listed in the CISA Known Exploited Vulnerabilities catalog, requires urgent attention from defenders and administrators. The vulnerability's details are limited, and verification from official sources is necessary. Affected product deployments need to be assessed for exposure, and mitigations should be prioritized according to CISA's BOD 26-04 guidance. The potential for remote code execution, need for urgent patching, possible data breaches, and system compromise necessitate swift action.

Vendor
JetBrains
Product
TeamCity
CVSS
CRITICAL 9.8
CISA KEV
Listed
Original CVE published
2026-08-05
Original CVE updated
2026-08-05
Advisory published
2026-08-05
Advisory updated
2026-08-05

Who should care

Defenders and administrators of JetBrains TeamCity should assess exposure and prioritize mitigations according to CISA's BOD 26-04 guidance.

Why it matters

CVE-2026-63077 is a critical deserialization of untrusted data vulnerability in JetBrains TeamCity. Defenders should assess exposure and prioritize mitigations according to CISA's BOD 26-04 guidance. Details on exploitation and impact are limited, requiring verification from official sources.

  • Potential for remote code execution requires verification
  • Need for urgent patching or mitigations according to vendor instructions
  • Possible data breaches or system compromise if exploited
  • Verification of system integrity and monitoring for suspicious activity

Technical summary

A deserialization of untrusted data vulnerability exists in JetBrains TeamCity, as indicated by the CISA Known Exploited Vulnerabilities catalog and CVE Program record. This critical vulnerability has a high CVSS score of 9.8, indicating severe potential impacts. The vulnerability allows for potential remote code execution and could lead to data breaches or system compromise if exploited. Details on exploitation and impact are limited, requiring verification from official sources. Defenders should assess exposure and prioritize mitigations according to CISA's BOD

Defensive priority

High

Recommended defensive actions

  • Review and apply vendor instructions for mitigations
  • Ensure compliance with CISA's BOD 26-04 guidance
  • Evaluate asset internet exposure and adhere to BOD 26-04 patching guidelines

Evidence notes

The CISA Known Exploited Vulnerabilities catalog and CVE Program record indicate a deserialization of untrusted data vulnerability in JetBrains TeamCity. However, details on exploitation and impact are limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-63077 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-63077

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-63077 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-63077

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.