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Fencer Vulns
high 7.5

CVE-2026-33002 json

Jenkins has a DNS rebinding vulnerability in WebSocket CLI origin validation

published 2026-03-18 7 mo ago modified 2026-09-08 2 mo ago also BIT-jenkins-2026-33002 , EUVD-2026-12845 , GHSA-phhv-63fh-rrc8

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.jenkins-ci.main:jenkins-core 2.555
  • bitnami jenkins 2.541.3, 2.555.0
  • Jenkins Project Jenkins 2.555

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33002 updated cvss 5.9

jenkins: Jenkins: Origin validation bypass via DNS rebinding in CLI WebSocket endpoint

  • Red Hat OpenShift Developer Tools and Services jenkins
    affected: no fix planned “Out of support scope”
  • Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
7 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.jenkins-ci.main:jenkins-core
>=2.442, <2.555
2.555
bitnami jenkins
>=2.426.3, <2.541.3
>=2.542.0, <2.555.0
2.541.3
2.555.0

Affected products

  • Jenkins Project Jenkins

Classification

Weakness
  • CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action
  • CWE-346 Origin Validation Error
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.