CVE-2026-42521 json
Jenkins Matrix Authorization Strategy Plugin: Unsafe deserialization allows invocation of parameterless constructors
published 6mo ago modified 14d ago also EUVD-2026-26222 , GHSA-jp9r-mmhw-vff3
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven org.jenkins-ci.plugins:matrix-auth 3.2.10
- jenkins matrix_authorization_strategy 3.2.10
- org.jenkins-ci.plugins matrix-auth 3.2.10
Is CVE-2026-42521 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6mo ago
Exploit prediction
0.25% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.jenkins-ci.plugins:matrix-auth | >=2.0-beta-1, <3.2.10 |
3.2.10 |
Affected products
- Jenkins Project Jenkins Matrix Authorization Strategy Plugin
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
jenkins.io
/security/advisory/2026-04-29/#SECURITY-3676
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-42521
advisory
-
github.com
/jenkinsci/matrix-auth-plugin
package
Sources
- CVE List CVE-2026-42521
- GitHub Advisory GHSA-jp9r-mmhw-vff3
- NVD CVE-2026-42521
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.