What is CVE-2026-53914?

CVE-2026-53914 is a medium-severity vulnerability in Jetbrains Kotlin, classified under Deserialization of Untrusted Data. CVSS score: 6.7/10. Published 2026-06-26.

How severe is CVE-2026-53914?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Deserialization in Jetbrains Kotlin

CVE-2026-53914

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

Vulnerability class: Insecure Deserialization

Published 2026-06-26 · last modified 2026-06-27.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (24.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Jetbrains Kotlin — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

www.jetbrains.com/privacy-security/issues-fixed/ (Vendor Advisory)

Frequently asked questions

What is CVE-2026-53914?: CVE-2026-53914 is a medium-severity vulnerability in Jetbrains Kotlin, classified under Deserialization of Untrusted Data. CVSS score: 6.7/10. Published 2026-06-26.
How severe is CVE-2026-53914?: Medium severity. CVSS v3 base score is 6.7 out of 10.