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CVE-2026-53435 Jenkins

Affected softwareJenkins
Severity8.8 High CVSS 3.1 2 scores
Fixed in2.555.3, 2.568
WeaknessDeserialization of untrusted data (CWE-502)
Published10 Jun 2026
Updated26 Oct 2026

Description

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.

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

  • CISA KEV not listed
  • VulnCheck KEV listed Exploitation reported in the wild. 1 citation · 1 exploit · earliest 2026-06-15.
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed Published artifacts you can open, in GitHub PoC; first seen 2026-06-12.
  • EPSS 51% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99% of all scored CVEs.

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2026-53435 in VulnCheck (free account).

EvidenceSourceDetailDate
Reported exploitation x.com /DefusedCyber/status/2066446206285291526 2026-06-15
Exploit reference VulnCheck XDB 75739541e377 Exploit type: info-leak 2026-06-12
IndexArtifactStarsFirst seen
GitHub PoC An offensive security researcher + an AI vs. a fresh n-day: building the first public PoC for CVE-2026-53435 in one Friday night. Raw 8h20m log inside. 11 2026-06-12

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

Decided by A vulnerability class already blocked by an ARMR security rule
Finding Protected by Waratek's ARMR deserialization security rule, which blocks this class of attack at the JVM level without a rule written for this CVE specifically. The CVE's weakness is CWE-502: Deserialization of Untrusted Data.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=2487539 : a Red Hat bug: the triage, which links onward to the fix

How to mitigate CVE-2026-53435

Upgrade Jenkins to a release that fixes it: 2.555.3 or 2.568. Until you can, Waratek RASP blocks exploitation with its deserialization and process rules. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

CVSS

8.8 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CISA-ADP Secondary published
CVSS 3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H redhat-SADP Secondary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.jenkins-ci.main:jenkins-core 0 2.555.3 unbounded
org.jenkins-ci.main:jenkins-core 2.556 2.568 unbounded

Products and versions

2 products, 4 version entries
SourceVendorProductSchemeAffected versions
nvd jenkins jenkins generic < 2.555.3 · < 2.568
osv org.jenkins-ci.main jenkins-core generic < 2.555.3 · ≥ 2.556 and < 2.568

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=2487539 bugzilla
https://github.com/jenkinsci/jenkins/commit/d739f6a6266d WEB
https://github.com/jenkinsci/jenkins/commit/345a3190a49d1ac96c4ff1c2e9eef4102c8d63f6 WEB
https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3707 WEB
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53435.json WEB
https://github.com/jenkinsci/jenkins WEB
https://access.redhat.com/security/cve/CVE-2026-53435 WEB
https://access.redhat.com/errata/RHSA-2026:60259 WEB
https://access.redhat.com/errata/RHSA-2026:60256 WEB
https://access.redhat.com/errata/RHSA-2026:60254 WEB

Timeline

Published2026-06-10By the CVE Program.
VulnCheck KEV: earliest evidence2026-06-15Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
NVD record modified2026-10-26NVD's own last-modified date for this record.