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FreeBSD : www/nginx -- Remote Code Execution/DoS (3414ac89-4f9f-11f1-a1c0-0050569f0b83)

critical Nessus Plugin ID 314915

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 3414ac89-4f9f-11f1-a1c0-0050569f0b83 advisory.

 nginx development team reports:
 When using the proxy_set_body directive, an attacker might inject data in the proxied request to an HTTP/2 backend A heap memory buffer overflow might occur in a worker process while handling a specially crafted request by ngx_http_rewrite_module, potentially resulting in arbitrary code execution A heap memory buffer overread might occur in a worker process while handling a specially crafted response by ngx_http_scgi_module or ngx_http_uwsgi_module, allowing an attacker to cause a disclosure of worker process memory or segmentation fault in a worker process A heap memory buffer overread might occur in a worker process while handling a specially sent response with decoding from UTF-8 via the charset_map directive, allowing an attacker to cause a limited disclosure of worker proccess memory or segmentation fault in a worker process When using HTTP/3, processing of connection migration might cause new QUIC streams to receive a new client address before validation, allowing an attacker to cause address spoofing use-after-free might occur during DNS server response processing if the ssl_ocsp directive was used, allowing an attacker to cause worker process memory corruption or segmentation fault in a worker process

Tenable has extracted the preceding description block directly from the FreeBSD 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

http://www.nessus.org/u?fdd4fae8

Plugin Details

Severity: Critical

ID: 314915

File Name: freebsd_pkg_3414ac894f9f11f1a1c00050569f0b83.nasl

Version: 1.1

Type: Local

Published: 5/15/2026

Updated: 5/15/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

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-2026-42945

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:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-42945

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:nginx, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/14/2026

Vulnerability Publication Date: 5/13/2026

Reference Information

CVE: CVE-2026-40460, CVE-2026-40701, CVE-2026-42926, CVE-2026-42934, CVE-2026-42945, CVE-2026-42946