Jenkins is widely used in CI/CD; an RCE in core can compromise build pipelines, artifacts, and many organizations' infrastructure — merits broad IT notification.
CVE-2026-84645
RCE in Jenkins via crafted config.xml nesting allowing remote code execution.
Is CVE-2026-84645 being exploited?
Not confirmed. CVE-2026-84645 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.66% probability of exploitation in the next 30 days.
How severe is CVE-2026-84645?
CVE-2026-84645 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-84645?
Yes. A fix has been recorded for CVE-2026-84645. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-84645 affect?
CVE-2026-84645 affects Jenkins Core ≤2.579, Jenkins LTS ≤2.568.2, Jenkins servers accepting user-submitted config.xml. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-84645?
Upgrade to patched Jenkins releases per advisory; restrict config.xml uploads and tighten access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution as the Jenkins process via a crafted config.xml submitted over HTTP (Stapler), enabling code execution, pipeline/artifact compromise, and lateral movement.
Immediate action required