Jenkins CLI WebSocket DNS Rebinding 2.421-2.554 & LTS 2.426-2.541
CVE-2026-33002 Published on March 18, 2026
Jenkins 2.442 through 2.554 (both inclusive), LTS 2.426.3 through LTS 2.541.2 (both inclusive) performs origin validation of requests made through the CLI WebSocket endpoint by computing the expected origin for comparison using the Host or X-Forwarded-Host HTTP request headers, making it vulnerable to DNS rebinding attacks that allow bypassing origin validation.
Products Associated with CVE-2026-33002
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Affected Versions
Jenkins Project Jenkins:- Before 2.426.3 is unaffected.
- Version 2.427 and below 2.442 is unaffected.
- Version 2.555 and below * is unaffected.
- Version 2.541.3 and below 2.541.* is unaffected.