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.
Vulnerability Analysis
CVE-2026-33002 is exploitable with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Reliance on Reverse DNS Resolution for a Security-Critical Action
The software performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname.
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.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.