Bug#1132230: netty: CVE-2026-33871

[Salvatore Bonaccorso]

Source: netty
Version: 1:4.1.48-16
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for netty.

CVE-2026-33871[0]:
| Netty is an asynchronous, event-driven network application
| framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a
| remote user can trigger a Denial of Service (DoS) against a Netty
| HTTP/2 server by sending a flood of `CONTINUATION` frames. The
| server's lack of a limit on the number of `CONTINUATION` frames,
| combined with a bypass of existing size-based mitigations using
| zero-byte frames, allows an user to cause excessive CPU consumption
| with minimal bandwidth, rendering the server unresponsive. Versions
| 4.1.132.Final and 4.2.10.Final fix the issue.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-33871
    https://www.cve.org/CVERecord?id=CVE-2026-33871
[1] https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore