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Advisory record · GHSA-r937-wjx7-w2jp

JetBrains Kotlin: Unsafe Deserialization in Kotlin Build Cache Enables Code Execution

CVSS 6.7 MediumEPSS 0.0035 · 28th percentile

Published by the GitHub Advisory Database at 26 Jun 2026, 15:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.jetbrains.kotlin:kotlin-gradle-pluginMaven<2.4.20-Beta12.4.20-Beta1
Identifiers
GHSA-r937-wjx7-w2jp · CVE-2026-53914
Weakness (CWE)
CWE-502
Tags
Published
26 Jun 2026
Updated
12 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The kotlin-gradle-plugin package is vulnerable before 2.4.20-Beta1. Unsafe deserialization of build cache metadata allows code execution, but the source gives few details on what an attacker must do first. Upgrade to kotlin-gradle-plugin 2.4.20-Beta1 or later.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.7 Medium 3.1 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L CNA (JetBrains)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 28th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.