What is the CVSS score of CVE-2026-42521?

CVE-2026-42521 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-42521?

Yes, a patch is available for CVE-2026-42521. Update the affected software to the latest version immediately.

Jenkins CVE-2026-42521

EUVD-2026-26222 MEDIUM

Deserialization of Untrusted Data (CWE-502)

2026-04-29 jenkins

Jenkins Information Disclosure Deserialization

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

CVSS changed

Apr 29, 2026 - 15:22 NVD

6.5 (None) 6.5 (MEDIUM)

EUVD ID Assigned

Apr 29, 2026 - 14:00 euvd

EUVD-2026-26222

CVE Published

Apr 29, 2026 - 13:31 nvd

MEDIUM 6.5

DescriptionCVE.org

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.