JetBrains TeamCity Deserialization of Untrusted Data Vulnerability

JetBrains TeamCity

JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol. Added to CISA KEV on 2026-08-05 (federal deadline 2026-08-08).

First seen: 5 Aug 2026
Last update: 5 Aug 2026, 12:00 UTC
Identifiers: CVE-2026-63077
Source: CISA KEV
On the menu as: CI servers

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## JetBrains TeamCity Deserialization of Untrusted Data Vulnerability
Severity: critical, exploited in the wild. Patch status: patched.
Affected: JetBrains TeamCity
Ids: CVE-2026-63077

JetBrains TeamCity contains a deserialization of untrusted data vulnerability that could allow unauthenticated remote code execution via the agent polling protocol. Added to CISA KEV on 2026-08-05 (federal deadline 2026-08-08).

## Steps
1. This touches infrastructure (ci). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-63077") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://blog.jetbrains.com/teamcity/2026/07/cve-2026-63077/ https://nvd.nist.gov/vuln/detail/CVE-2026-63077 https://www.jetbrains.com/privacy-security/issues-fixed/
https://pwned.coffee/i/jetbrains-teamcity-deserialization-of-untrusted-data-vul-cve-2026-63077

Sources

Totalone very hot coffee