Detections
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CentOS 9 : nghttp2-1.43.0-8.el9

medium Nessus Plugin ID 337898

Synopsis

The remote CentOS host is missing a security update for libnghttp2.

Description

The remote CentOS Linux 9 host has packages installed that are affected by a vulnerability as referenced in the nghttp2-1.43.0-8.el9 build changelog.

 - nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content- Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.
 (CVE-2026-58055)

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 CentOS 9 Stream libnghttp2 package.

See Also

https://kojihub.stream.centos.org/koji/buildinfo?buildID=124529

Plugin Details

Severity: Medium

ID: 337898

File Name: centos9_nghttp2-1_43_0-8_124529.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/19/2026

Updated: 8/19/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.62

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.1

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

CVSS Score Source: CVE-2026-58055

CVSS v3

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.9

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 2.9

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

CPE: cpe:/a:centos:centos:9, p-cpe:/a:centos:centos:libnghttp2-devel, p-cpe:/a:centos:centos:libnghttp2, p-cpe:/a:centos:centos:nghttp2

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/13/2026

Vulnerability Publication Date: 6/28/2026

Reference Information

CVE: CVE-2026-58055