FreeBSD : nginx -- multiple vulnerabilities (46b654f8-6b28-11f1-b8e5-3497f65b111b)

critical Nessus Plugin ID 321768

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 46b654f8-6b28-11f1-b8e5-3497f65b111b advisory.

The nginx developers report:

A heap memory buffer overflow vulnerability when using the ignore_invalid_headers off; and large_client_header_buffers directives with large configured values while proxying a specially crafted request to an HTTP/2 or gRPC backend may allow memory corruption or a segmentation fault in a worker process (CVE-2026-42055).

A heap memory buffer overread vulnerability while handling a specially crafted response with decoding from UTF-8 via the charset_map directive may allow limited disclosure of worker process memory or a segmentation fault in a worker process (CVE-2026-48142).

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.

Plugin Details

Severity: Critical

ID: 321768

File Name: freebsd_pkg_46b654f86b2811f1b8e53497f65b111b.nasl

Version: 1.1

Type: Local

Family: FreeBSD Local Security Checks

Published: 6/20/2026

Updated: 6/20/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

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

CVSS Score Source: CVE-2026-42055

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

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:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.2

Threat Vector: CVSS:4.0/E:U

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

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 Ease: No known exploits are available

Patch Publication Date: 6/17/2026

Vulnerability Publication Date: 6/17/2026

Reference Information

CVE: CVE-2026-42055, CVE-2026-48142

IAVA: 2026-A-0601

Detections

Analytics