Vulnerability · Published Jun 26, 2026 · Assigned by JetBrains
CVE-2026-53914
Medium 6.7
In plain English
A medium-severity unsafe deserialization in Kotlin from JetBrains. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.7Medium
Exploit odds (30 days)0.3%top 73.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.jetbrains.kotlin:kotlin-gradle-plugin | 2.4.20-Beta1 | GHSA-r937-wjx7-w2jp |
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L