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Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : nginx vulnerabilities (USN-8354-1)

critical Nessus Plugin ID 318250

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8354-1 advisory.

 It was discovered that nginx did not properly validate source addresses in the HTTP/3 QUIC module. A remote attacker could possibly use this issue to bypass authorization checks or rate limiting. This issue only affected Ubuntu 25.04 and Ubuntu 25.10. (CVE-2026-40460)

 It was discovered that nginx contained a use-after-free vulnerability in the ngx_http_ssl_module module when client certificate verification and OCSP validation were enabled. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly modify data in memory.
 (CVE-2026-40701)

 It was discovered that nginx did not properly handle certain proxied responses in the ngx_http_charset_module module. A remote attacker could possibly use this issue to obtain sensitive information or cause nginx to crash, resulting in a denial of service. (CVE-2026-42934)

 It was discovered that nginx did not properly process certain SCGI and uWSGI responses. An attacker able to perform a machine-in-the-middle attack could possibly use this issue to obtain sensitive information or cause nginx to crash, resulting in a denial of service. (CVE-2026-42946)

 It was discovered that nginx incorrectly handled certain rewrite rules in the ngx_http_rewrite_module module. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-9256)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8354-1

Plugin Details

Severity: Critical

ID: 318250

File Name: ubuntu_USN-8354-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/2/2026

Updated: 6/2/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P

CVSS Score Source: CVE-2026-40460

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2026-9256

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 8.2

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-9256

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-subs-filter, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-echo, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-geoip2, p-cpe:/a:canonical:ubuntu_linux:nginx-extras, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-cache-purge, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:nginx-common, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-auth-pam, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-xslt-filter, p-cpe:/a:canonical:ubuntu_linux:nginx-dev, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-geoip, p-cpe:/a:canonical:ubuntu_linux:nginx-light, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-dav-ext, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-image-filter, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-uploadprogress, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-ndk, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-upstream-fair, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream-geoip, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-headers-more-filter, p-cpe:/a:canonical:ubuntu_linux:nginx, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream-geoip2, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-perl, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-mail, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-rtmp, p-cpe:/a:canonical:ubuntu_linux:nginx-full, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-nchan, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-fancyindex, p-cpe:/a:canonical:ubuntu_linux:nginx-core

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/1/2026

Vulnerability Publication Date: 5/13/2026

Reference Information

CVE: CVE-2026-40460, CVE-2026-40701, CVE-2026-42934, CVE-2026-42946, CVE-2026-9256

IAVA: 2026-A-0515

USN: 8354-1