GHSA-g2xq-2v27-4rh3
Jenkins arbitrary type deserialization from attacker-controlled config.xml allows remote code execution and user impersonation
Quick fix
GHSA-g2xq-2v27-4rh3 — org.jenkins-ci.main:jenkins-core: upgrade to the fixed version with the command below.
# pom.xml: bump <version>2.555.3</version> for org.jenkins-ci.main:jenkins-coreDetails
In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them to handle HTTP requests afterwards.
This can be used to impersonate any user and send HTTP requests on their behalf, up to and including use of the Script Console to run arbitrary code, or to read arbitrary files from the Jenkins controller.
Are you affected?
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Affected packages
0 Fixed in: 2.555.3 # pom.xml: bump <version>2.555.3</version> for org.jenkins-ci.main:jenkins-core 2.556 Fixed in: 2.568 # pom.xml: bump <version>2.568</version> for org.jenkins-ci.main:jenkins-core References
- https://nvd.nist.gov/vuln/detail/CVE-2026-53435 [ADVISORY]
- https://github.com/jenkinsci/jenkins/commit/345a3190a49d1ac96c4ff1c2e9eef4102c8d63f6 [WEB]
- https://github.com/jenkinsci/jenkins/commit/d739f6a6266d [WEB]
- https://access.redhat.com/security/cve/CVE-2026-53435 [WEB]
- https://bugzilla.redhat.com/show_bug.cgi?id=2487539 [WEB]
- https://github.com/jenkinsci/jenkins [WEB]
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53435.json [WEB]
- https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3707 [WEB]