9.8

CVE-2026-53914: jetbrains kotlin Deserialization of Untrusted Data

CVSS: 9.8v3.1CriticalAnalyzed
AliasesGHSA-r937-wjx7-w2jp
Published 26-06-2026Last modified 27-06-2026
Open JSON

Vulnerability summary

CVE-2026-53914 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in jetbrains kotlin. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 25% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.33%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-06-2026
    PublishedVulnerability first disclosed.
  2. 27-06-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

25%

Versus all other CVEs

30-day change

0.00 pp

From 0.33% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.33%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Jetbrains1 product
Org.jetbrains.kotlin1 product
  • kotlin-gradle-plugin< 2.4.20-Beta1

2 vendors · 2 products

References

6 links