Jenkins is widely deployed; deserialization bypass enabling controller compromise is high-impact across many orgs.
CVE-2026-70426
Jenkins Remoting bypasses JEP-200 deserialization filter enabling agent-based compromises.
Is CVE-2026-70426 being exploited?
Not confirmed. CVE-2026-70426 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 0.31% probability of exploitation in the next 30 days.
How severe is CVE-2026-70426?
CVE-2026-70426 is rated Critical with a CVSS score of 9.0. 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-2026-70426?
Yes. A fix has been recorded for CVE-2026-70426. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-70426 affect?
CVE-2026-70426 affects Jenkins core <= 2.575, Jenkins LTS <= 2.568.1, Remoting <= 3384.v60d89463d9e0, Jenkins agents. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70426?
Upgrade Jenkins/Remoting to fixed versions and restrict Agent/Connect permissions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows agents or attackers with Agent/Connect to bypass deserialization filter and execute arbitrary code on the Jenkins controller.
Immediate action required