Clojure classes can be used to craft a serialized object that runs arbitrary code on deserialization

CRITICAL 9.8CVE-2017-20189 · GHSA-jgxc-8mwq-9xqw · Published 22/01/2024 · updated 17/06/2026

In short

CVE-2017-20189 is a CRITICAL (CVSS 9.8) vulnerability affecting org.clojure:clojure, clojure (clojure).
Chance of exploitation in the next 30 days (EPSS): 1.3%, higher than 71.2% of all vulnerabilities.
Fix: update to 1.9.0 or later.

Package	Affected versions	Patched versions
org.clojure:clojure Maven	`< 1.9.0`	`1.9.0`
clojure clojure	`< 1.9.0`	`1.9.0`

Description

In Clojure before 1.9.0, classes can be used to construct a serialized object that executes arbitrary code upon deserialization. This is relevant if a server deserializes untrusted objects.

NVD description

In Clojure before 1.9.0, classes can be used to construct a serialized object that executes arbitrary code upon deserialization. This is relevant if a server deserializes untrusted objects.

References

nvd.nist.gov/vuln/detail/CVE-2017-20189 · ADVISORY
frohoff/ysoserial#68 · WEB
clojure/clojure commit 271674c · WEB
clojure.atlassian.net/browse/CLJ-2204 · WEB
clojure/clojure · PACKAGE
groups.google.com/d/msg/clojure/WaL3hHzsevI/7zHU-L7LBQAJ · WEB
hackmd.io/%40fe1w0/HyefvRQKp · WEB
security.netapp.com/advisory/ntap-20241108-0002 · WEB
security.snyk.io/vuln/SNYK-JAVA-ORGCLOJURE-5740378 · WEB
security.netapp.com/advisory/ntap-20241108-0002

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Package

Affected versions

Patched versions

org.clojure:clojure

Maven

< 1.9.0

1.9.0

clojure

< 1.9.0

1.9.0

Description

In Clojure before 1.9.0, classes can be used to construct a serialized object that executes arbitrary code upon deserialization. This is relevant if a server deserializes untrusted objects.

NVD description

In Clojure before 1.9.0, classes can be used to construct a serialized object that executes arbitrary code upon deserialization. This is relevant if a server deserializes untrusted objects.