Read the docs
TI-2026-38890 Aliases CVE-2026-53914GHSA-r937-wjx7-w2jp

In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata

Priority MEDIUM 43CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0035 28th percentileScored 2026-11-07
Fix Fixed Kotlin (JetBrains): 2.4.20org.jetbrains.kotlin:kotlin-gradle-plugin (Maven): 2.4.20-Beta1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
JetBrainsKotlinbefore 2.4.202.4.20Patch availableCNA
—org.jetbrains.kotlin:kotlin-gradle-plugin (Maven)before 2.4.20-Beta12.4.20-Beta1Patch availableGHSA-r937-wjx7-w2jp
  • Kotlin VendorJetBrains Affected before 2.4.20 Fixed in 2.4.20 Patch available CNA
  • org.jetbrains.kotlin:kotlin-gradle-plugin (Maven) Vendor— Affected before 2.4.20-Beta1 Fixed in 2.4.20-Beta1 Patch available GHSA-r937-wjx7-w2jp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:jetbrains:kotlin:*:*:*:*:*:*:*:*before 2.4.20VulnerableJetBrains
  • cpe:2.3:a:jetbrains:kotlin:*:*:*:*:*:*:*:* Versions before 2.4.20 Vulnerable ·JetBrains

Remediation

  • Fix · CNA Kotlin (JetBrains) Fixed in 2.4.20
  • Fix · GHSA-r937-wjx7-w2jp org.jetbrains.kotlin:kotlin-gradle-plugin (Maven) Fixed in 2.4.20-Beta1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53914
  2. 2026-10-03 Alias added: GHSA-r937-wjx7-w2jp

References

Advisory 2

Other 4

  • TI-2020-12453 In JetBrains Kotlin from 1.4-M1 to 1.4-RC (as Kotlin 1.3.7x is not affected by the issue. CVSS 3.1HIGH 8.8
  • TI-2019-07425 JetBrains Kotlin versions before 1.3.30 were resolving artifacts using an http connection… CVSS 3.1HIGH 8.1
  • TI-2019-07427 JetBrains IntelliJ IDEA projects created using the Kotlin (JS Client/JVM Server) IDE… CVSS 3.0HIGH 8.1
  • TI-2019-07426 JetBrains Ktor framework (created using the Kotlin IDE template) versions before 1.1.0… CVSS 3.0HIGH 8.1
  • TI-2020-17771 In JetBrains Kotlin before 1.4.21, a vulnerable Java API was used for temporary file and… CVSS 3.1MEDIUM 5.3
  • TI-2022-08207 In JetBrains Kotlin before 1.6.0, it was not possible to lock dependencies for Multiplatform Gradle Projects. CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences