Debian 11 python-tornado Critical Custom Phrases DoS CVE-2025-67724

CVE-2025-67724

Custom reason phrases can cause multiple vulnerabilities (like XSS,
header injection, ...) due to being used unescaped in HTTP headers.

CVE-2025-67725

A single maliciously crafted HTTP request can cause a possible DoS
due to quadratic performance of repeated header lines.

CVE-2025-67726

An inefficient algorithm when parsing parameters for HTTP header
values can potentially cause a DoS.

For Debian 11 bullseye, these problems have been fixed in version
6.1.0-1+deb11u3.

We recommend that you upgrade your python-tornado packages.

For the detailed security status of python-tornado please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/python-tornado

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS