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Fencer Intel
high 8.8

CVE-2026-18661 json

In Eclipse Jetty, across various versions of `jetty-annotations`, and `jetty-eeN-annotations`, the Jakarta Spec authoritative url-pattern r…

published 25d ago modified 25d ago also EUVD-2026-101954

cvss
8.8
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

In Eclipse Jetty, across various versions of `jetty-annotations`, and `jetty-eeN-annotations`, the Jakarta Spec authoritative url-pattern rules for mixed `@ServletSecurity` annotation, and `web.xml` defined `security-constraint` on the same `url-pattern` were not being applied if the `web.xml` had more than 1 `url-pattern` for a servlet, and had a `security-constraint` applying to only some of those `url-pattern` definitions.

Patch / fix

  • org.eclipse.jetty.ee10 jetty-ee10-annotations 12.0.39, 12.1.12
  • org.eclipse.jetty.ee9 jetty-ee9-annotations 12.0.39, 12.1.12
  • org.eclipse.jetty.ee8 jetty-ee8-annotations 12.0.39, 12.1.12
  • org.eclipse.jetty jetty-annotations 9.4.65, 10.0.33, 11.0.33
  • jetty12 Debian 14 12.0.39-1

debian advisories DEBIAN-CVE-2026-18661

Is CVE-2026-18661 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-18661 updated cvss 8.2

org.eclipse.jetty/jetty-annotations: org.eclipse.jetty.ee8/jetty-ee8-annotations: org.eclipse.jetty.ee9/jetty-ee9-annotations: org.eclipse.jetty.ee10/jetty-ee10-annotations: Eclipse Jetty: Access cont

  • Red Hat build of Apache Camel - HawtIO 4 jetty-annotations 12.1.11.redhat-00001 Red Hat build of Apache Camel for Spring Boot 4 jetty-annotations 12.1.11.redhat-00001, jetty-ee8-annotations 12.1.11.redhat-00001, jetty-ee9-annotations 12.1.11.redhat-00001, jetty-ee10-annotations 12.0.37.redhat-00001 Red Hat Enterprise Linux 8 resteasy, resteasy-javadoc Red Hat Enterprise Linux 9 jmc, resteasy, pki-resteasy-core, pki-resteasy-client, pki-resteasy-jackson2-provider, pki-resteasy-servlet-initializer Red Hat Fuse 7 jetty-annotations 12.1.11.redhat-00001 Red Hat OpenShift Dev Spaces devspaces/openvsx-rhel9, devspaces/pluginregistry-rhel9
    affected: no fix available

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
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
25d ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/jetty/jetty.project/security/advisories/GHSA-v6xf-996f-c35f referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • Eclipse Foundation org.eclipse.jetty.ee11:jetty-ee11-annotations
  • Eclipse Foundation org.eclipse.jetty.ee10:jetty-ee10-annotations
  • Eclipse Foundation org.eclipse.jetty.ee9:jetty-ee9-annotations
  • Eclipse Foundation org.eclipse.jetty.ee8:jetty-ee8-annotations
  • Eclipse Foundation org.eclipse.jetty:jetty-annotations

Classification

Weakness

References

Sources

Fencer Intel 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.