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[USN-8210-1] nginx vulnerabilities

Posted on 27 April 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8210-1
April 27, 2026

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

- Ubuntu 25.10
- 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 the nginx ngx_mail_auth_http_module module
incorrectly handled certain requests. An attacker could possibly use this
issue to cause nginx to crash, resulting in a denial of service.
(CVE-2026-27651)

It was discovered that the nginx ngx_http_dav_module module incorrectly
handled certain destination URIs. An attacker could use this issue to cause
nginx to crash, resulting in a denial of service, or possibly modify source
or destination names outside of the document root. (CVE-2026-27654)

It was discovered that the nginx ngx_http_mp4_module module incorrectly
handled certain MP4 files. An attacker could use this issue to cause nginx
to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2026-27784, CVE-2026-32647)

It was discovered that the nginx ngx_mail_smtp_module module incorrectly
handled certain CRLF sequences. An attacker could possibly use this issue
to inject arbitrary SMTP headers. (CVE-2026-28753)

It was discovered that the nginx ngx_stream_ssl_module module incorrectly
handled revoked certificates. This could result in successful TLS
handshakes even after an OCSP check identifies a certificate as revoked,
contrary to expectations. This issue only affected Ubuntu 24.04 LTS and
Ubuntu 25.10. (CVE-2026-28755)

Update instructions:

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

Ubuntu 25.10
nginx 1.28.0-6ubuntu1.2
nginx-core 1.28.0-6ubuntu1.2
nginx-extras 1.28.0-6ubuntu1.2
nginx-full 1.28.0-6ubuntu1.2
nginx-light 1.28.0-6ubuntu1.2

Ubuntu 24.04 LTS
nginx 1.24.0-2ubuntu7.7
nginx-core 1.24.0-2ubuntu7.7
nginx-extras 1.24.0-2ubuntu7.7
nginx-full 1.24.0-2ubuntu7.7
nginx-light 1.24.0-2ubuntu7.7

Ubuntu 22.04 LTS
nginx 1.18.0-6ubuntu14.10
nginx-core 1.18.0-6ubuntu14.10
nginx-extras 1.18.0-6ubuntu14.10
nginx-full 1.18.0-6ubuntu14.10
nginx-light 1.18.0-6ubuntu14.10

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

References:
https://ubuntu.com/security/notices/USN-8210-1
CVE-2026-27651, CVE-2026-27654, CVE-2026-27784, CVE-2026-28753,
CVE-2026-28755, CVE-2026-32647

Package Information:
https://launchpad.net/ubuntu/+source/nginx/1.28.0-6ubuntu1.2
https://launchpad.net/ubuntu/+source/nginx/1.24.0-2ubuntu7.7
https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.10

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