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10.0

JetBrains TeamCity could let attackers run code on server

CVE-2026-106218 · published 3 days ago
Summary

TeamCity versions earlier than 2026.1.3 allow specially crafted Kotlin scripts to break out of the safe sandbox and execute commands on the server. This could let an attacker take control of the build server and access internal systems. Update TeamCity to the latest version or apply the provided patches to close the escape.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
jetbrains teamcity < 2026.1.3 2025.11.7
< 2025.11.7
>= 2026.1.1, < 2026.1.3
Original advisory text
In JetBrains TeamCity before 2026.1.3 2025.11.7 kotlin DSL sandbox escape leading to RCE on the server was possible
In JetBrains TeamCity before 2026.1.3
2025.11.7 kotlin DSL sandbox escape leading to RCE on the server was possible
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
10.0 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-184Incomplete List of Disallowed Inputs
Timeline
Published6 Oct 2026
Updated10 Oct 2026
First seen6 Oct 2026
Sources
CVE-2026-106218 · NVD
CVE-2026-106218 · MITRE
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