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

Also known as GHSA-jgxc-8mwq-9xqw

Published 2 y ago 2024-01-22 · modified 4 mo ago 2026-06-17 · JSON

CVSS

9.8

v3.1 · CNA

CISA KEV

not known exploited

EPSS

1.3%

percentile 71%

Public exploits

none known

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.

CISA SSVC assessment

Exploitation: Proof of concept public
Automatable: yes
Technical impact: total
Assessed: 17 mo ago 2025-05-08

Exploit prediction (EPSS)

1.33% probability of exploitation in the next 30 days, higher than 71% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
CISA ADP	3.1	9.8	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
NVD	3.1	9.8	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CNA	3.1	9.8	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
GitHub	3.1	9.8	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected packages

Ecosystem	Package	Affected	Fixed in
maven	`org.clojure:clojure`	<1.9.0	1.9.0

Classification

Weakness

CWE-502 Deserialization of Untrusted Data

References

hackmd.io /%40fe1w0/HyefvRQKp · x_transferred
clojure.atlassian.net /browse/CLJ-2204 · x_transferred
github.com /frohoff/ysoserial/pull/68/files · x_transferred
github.com /clojure/clojure/commit/271674c9b484d798484d134a5ac40a6df15d3ac3 · x_transferred
security.snyk.io /vuln/SNYK-JAVA-ORGCLOJURE-5740378 · x_transferred
security.netapp.com /advisory/ntap-20241108-0002/
nvd.nist.gov /vuln/detail/CVE-2017-20189 · advisory
github.com /clojure/clojure · package
groups.google.com /d/msg/clojure/WaL3hHzsevI/7zHU-L7LBQAJ · web
security.netapp.com /advisory/ntap-20241108-0002 · web

Sources

CVE List: CVE-2017-20189
GitHub Advisory: GHSA-jgxc-8mwq-9xqw
NVD: CVE-2017-20189

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.

Summary