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RHEL 9 : nginx:1.26 (RHSA-2026:36639)

critical Nessus Plugin ID 325670

Synopsis

The remote Red Hat host is missing a security update.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:36639 advisory.

 nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage.

 Security Fix(es):

 * nginx: NGINX: Arbitrary code execution or Denial of Service via heap-based buffer overflow with crafted HTTP/2 headers (CVE-2026-42055)

 Bug Fix(es) and Enhancement(s):

 * nginx:1.26/nginx: HTTP/2 bomb nginx fix breaks module ABI causing crashes [rhel-9.8.z] (JIRA:RHEL-191774)

 For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

Solution

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2026:36639

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2489866

http://www.nessus.org/u?a1cf88b1

Plugin Details

Severity: Critical

ID: 325670

File Name: redhat-RHSA-2026-36639.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/8/2026

Updated: 7/8/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.7

Percentile: 99.06

Vendor

Vendor Severity: Important

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:redhat:enterprise_linux:nginx-mod-http-perl, p-cpe:/a:redhat:enterprise_linux:nginx-all-modules, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:nginx-mod-devel, p-cpe:/a:redhat:enterprise_linux:nginx-core, p-cpe:/a:redhat:enterprise_linux:nginx-mod-http-image-filter, p-cpe:/a:redhat:enterprise_linux:nginx-mod-mail, p-cpe:/a:redhat:enterprise_linux:nginx-mod-stream, p-cpe:/a:redhat:enterprise_linux:nginx, cpe:/o:redhat:rhel_eus:9.8, p-cpe:/a:redhat:enterprise_linux:nginx-filesystem, p-cpe:/a:redhat:enterprise_linux:nginx-mod-http-xslt-filter

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 7/8/2026

Vulnerability Publication Date: 6/17/2026

Reference Information

CVE: CVE-2026-42055

CWE: 131

RHSA: 2026:36639