CVE-2026-100253
Analyzed Analyzed - Analysis Complete

JetBrains TeamCity Sandbox Escape via Kotlin DSL

Publication date: 2026-09-30

Last updated on: 2026-10-06

Assigner: JetBrains s.r.o.

Description
In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 sandbox escape leading to code execution was possible via the versioned settings Kotlin DSL

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Meta Information

Published
2026-09-30
Last Modified
2026-10-06
Generated
2026-11-08
AI Q&A
2026-09-30
EPSS Evaluated
2026-11-07
NVD
CVE-2026-100253
EUVD
EUVD-2026-89997

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
jetbrains teamcity to 2025.11.8 (exc)
jetbrains teamcity From 2026.1 (inc) to 2026.1.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-184 The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.

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Executive Summary

This vulnerability in JetBrains TeamCity before versions 2026.2, 2026.1.4, and 2025.11.8 allows sandbox escape leading to code execution via the versioned settings Kotlin DSL.

Detection Guidance

This vulnerability involves sandbox escape in JetBrains TeamCity versions before 2026.2, 2026.1.4, and 2025.11.8. Detection requires checking TeamCity version and reviewing Kotlin DSL settings for suspicious configurations.

Impact Analysis

An attacker with access could escape the sandbox and execute arbitrary code on the TeamCity server, potentially leading to full system compromise, data theft, or further network infiltration.

Compliance Impact

This vulnerability could lead to unauthorized code execution, potentially causing data breaches. This may violate GDPR (data protection) and HIPAA (health data security) requirements for access controls and breach notification.

Mitigation Strategies

Update JetBrains TeamCity to version 2026.2, 2026.1.4, or 2025.11.8 or later to address the sandbox escape vulnerability.

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