CVE-2026-100660 Netty HTTP/3 codec - Denial of Service

Netty HTTP/3 codec 4.2.0.Final through 4.2.17.Final contains a denial of service caused by unbounded per-stream QPACK encoder state retention, letting remote unauthenticated HTTP/3 clients exhaust server memory, exploit requires crafted HTTP/3 requests without Section Acknowledgments.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
26 September 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Upgrade to version 4.2.18.Final or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs