Home / mailings [SECURITY] [DSA 6575-1] nginx security update
Posted on 21 October 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6575-1 security@debian.org
https://www.debian.org/security/ Jan Mojžíš
October 21, 2026 https://www.debian.org/security/faq
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Package : nginx
CVE ID : CVE-2026-15176 CVE-2026-93479 CVE-2026-95101 CVE-2026-97205
CVE-2026-97629
Several vulnerabilities were discovered in nginx, a high performance web
and reverse proxy server. Depending on the configuration, these could
result in memory corruption, denial of service, injection of requests to
backend servers, or bypass of client certificate authentication.
CVE-2026-15176
Mapping a rewritten request URI to a filesystem path in a location
using the alias directive could cause a buffer overflow.
CVE-2026-93479
Evaluation of string expressions in the HTTP and stream modules
could overwrite reserved buffer space, resulting in a buffer overflow.
Affected operations include evaluation of variable document roots
and access log paths.
The affected code was introduced into the trixie package by an earlier
security backport.
CVE-2026-95101
Incorrect handling of fragmented unknown HTTP/3 frames could cause
their contents to be treated as request body data. When proxying
requests, this could allow injection of requests into a backend server
or bypass of request body size limits.
CVE-2026-97205
A counter tracking pending asynchronous operations could overflow,
causing request memory to be freed while still in use. This
use-after-free could result in memory corruption or denial of service.
CVE-2026-97629
Incomplete synchronisation of TLS session ticket keys between worker
processes could leave a worker using uninitialised key material. This
could allow forged TLS sessions and bypass of client certificate
authentication.
For the stable distribution (trixie), these problems have been fixed in
version 1.26.3-3+deb13u10.
We recommend that you upgrade your nginx packages.
For the detailed security status of nginx please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/nginx
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
