CVE-2026-18660 PUBLISHED

Jetty proxy blacklist performs case-sensitive matching of case-insensitive DNS hostnames

Assigner: eclipse
Reserved: 03.08.2026 Published: 15.10.2026 Updated: 15.10.2026

In Eclipse Jetty, across various versions of jetty-server, and jetty-proxy, the host whitelist/blacklist is case-sensitive, and would allow hosts through that only differ by case.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 8.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Eclipse Foundation
Product
Versions	Default: unaffected affected from 12.1.0 to 12.1.11 (incl.) affected from 12.0.0 to 12.0.38 (incl.)

Vendor	Eclipse Foundation
Product
Versions	Default: unaffected affected from 11.0.0 to 11.0.32 (incl.) affected from 10.0.0 to 10.0.32 (incl.) affected from 9.0.0 to 9.4.64 (incl.)

CVE-2026-18660 PUBLISHED

Jetty proxy blacklist performs case-sensitive matching of case-insensitive DNS hostnames

Metrics

Product Status

Credits

References

Problem Types