Vulnerability · Published Apr 29, 2026 · Assigned by jenkins

CVE-2026-42521

Medium 6.5

In plain English

A medium-severity unsafe deserialization in Jenkins Matrix Authorization Strategy Plugin from Jenkins Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 84.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Jenkins Matrix Authorization Strategy Plugin 2.0-beta-1 through 3.2.9 (both inclusive) invokes parameterless constructors of classes specified in configuration when deserializing inheritance strategies, without restricting the classes that can be instantiated, allowing attackers with Item/Configure permission to instantiate arbitrary types, which may lead to information disclosure or other impacts depending on the classes available on the classpath.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	org.jenkins-ci.plugins:matrix-auth	3.2.10	GHSA-jp9r-mmhw-vff3

Affected products (as reported)

Vendor	Product	Versions
Jenkins Project	Jenkins Matrix Authorization Strategy Plugin	2.0-beta-1 – through 3.2.9

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

Jenkins Security Advisory 2026-04-29 vendor-advisory