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[USN-8955-1] nginx vulnerabilities

Posted on 26 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8955-1
October 26, 2026

nginx vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.10
- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in nginx.

Software Description:
- nginx: small, powerful, scalable web/proxy server

Details:

It was discovered that nginx incorrectly handled certain configurations
using the alias directive together with rewrite rules. A remote attacker
could possibly use this issue to cause nginx to crash, resulting in a
denial of service, or execute arbitrary code.
(CVE-2026-15176)

It was discovered that nginx incorrectly handled map directives using
regex matching under certain circumstances. A remote attacker could
possibly use this issue to cause nginx to crash, resulting in a denial
of service, or execute arbitrary code.
(CVE-2026-93479)

It was discovered that nginx incorrectly handled HTTP/3 requests when
proxy_request_buffering was enabled. This issue only affected
Ubuntu 26.04 LTS and Ubuntu 26.10. A remote attacker could possibly use
this issue to inject data into proxied requests.
(CVE-2026-95101)

It was discovered that nginx incorrectly handled asynchronous file I/O
in certain configurations with Server Side Includes pages. A remote
attacker could possibly use this issue to cause nginx to crash,
resulting in a denial of service, or execute arbitrary code.
(CVE-2026-97205)

It was discovered that nginx incorrectly handled SSL session ticket keys
when configured with a shared session cache but without explicit ticket
key rotation. This issue only affected Ubuntu 24.04 LTS, Ubuntu 26.04 LTS,
and Ubuntu 26.10. A remote attacker
could possibly use this issue to forge client SSL sessions and bypass
client certificate verification.
(CVE-2026-97629)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.10
nginx 1.30.4-7ubuntu1.1
nginx-core 1.30.4-7ubuntu1.1
nginx-extras 1.30.4-7ubuntu1.1
nginx-full 1.30.4-7ubuntu1.1
nginx-light 1.30.4-7ubuntu1.1

Ubuntu 26.04 LTS
nginx 1.28.3-2ubuntu1.12
nginx-core 1.28.3-2ubuntu1.12
nginx-extras 1.28.3-2ubuntu1.12
nginx-full 1.28.3-2ubuntu1.12
nginx-light 1.28.3-2ubuntu1.12

Ubuntu 24.04 LTS
nginx 1.24.0-2ubuntu7.19
nginx-core 1.24.0-2ubuntu7.19
nginx-extras 1.24.0-2ubuntu7.19
nginx-full 1.24.0-2ubuntu7.19
nginx-light 1.24.0-2ubuntu7.19

Ubuntu 22.04 LTS
nginx 1.18.0-6ubuntu14.22
nginx-core 1.18.0-6ubuntu14.22
nginx-extras 1.18.0-6ubuntu14.22
nginx-full 1.18.0-6ubuntu14.22
nginx-light 1.18.0-6ubuntu14.22

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8955-1
CVE-2026-15176, CVE-2026-93479, CVE-2026-95101, CVE-2026-97205,
CVE-2026-97629

Package Information:
https://launchpad.net/ubuntu/+source/nginx/1.30.4-7ubuntu1.1
https://launchpad.net/ubuntu/+source/nginx/1.28.3-2ubuntu1.12
https://launchpad.net/ubuntu/+source/nginx/1.24.0-2ubuntu7.19
https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.22

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