TeamCity < 2026.1.3 Kotlin DSL Sandbox Escape (RCE)
CVE-2026-106218 Published on October 6, 2026
In JetBrains TeamCity before 2026.1.3 2025.11.7 kotlin DSL sandbox escape leading to RCE on the server was possible
Vulnerability Analysis
CVE-2026-106218 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Denylist / Deny List Vulnerability?
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, leading to resultant weaknesses. Developers often try to protect their products against malicious input by performing tests against inputs that are known to be bad, such as special characters that can invoke new commands. However, such lists often only account for the most well-known bad inputs. Attackers may be able to find other malicious inputs that were not expected by the developer, allowing them to bypass the intended protection mechanism.
CVE-2026-106218 has been classified to as a Denylist / Deny List vulnerability or weakness.
Products Associated with CVE-2026-106218
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Affected Versions
JetBrains TeamCity:- Before 2026.1.3 2025.11.7 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.