Critical severity · published Jun 26, 2026
CVE-2026-53914
In JetBrains Kotlin before 2.4.20 code execution was possible via unsafe deserialization in the build cache metadata
9.8
CVSS
0.3%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KO
Kotlin · JetBrains
before 2.4.20 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53914
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53914
Vendor Advisory
https://www.jetbrains.com/privacy-security/issues-fixed/
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