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Linux Distros Unpatched Vulnerability : CVE-2026-4271

medium Nessus Plugin ID 302759

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use- After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS). (CVE-2026-4271)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-4271

https://security-tracker.debian.org/tracker/CVE-2026-4271

Plugin Details

Severity: Medium

ID: 302759

File Name: unpatched_CVE_2026_4271.nasl

Version: 1.2

Type: local

Agent: unix

Family: Misc.

Published: 3/17/2026

Updated: 3/17/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.3

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

CVSS Score Source: CVE-2026-4271

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.9

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

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:libsoup3, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:centos:centos:libsoup3-devel, p-cpe:/a:redhat:enterprise_linux:libsoup-devel, p-cpe:/a:redhat:enterprise_linux:libsoup3-devel, cpe:/o:debian:debian_linux:14.0, cpe:/o:centos:centos:7, p-cpe:/a:debian:debian_linux:libsoup2.4, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:centos:centos:libsoup3-doc, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:centos:centos:libsoup3, cpe:/o:redhat:enterprise_linux:9, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:debian:debian_linux:libsoup3, p-cpe:/a:centos:centos:libsoup, p-cpe:/a:redhat:enterprise_linux:libsoup, p-cpe:/a:redhat:enterprise_linux:libsoup3-doc, p-cpe:/a:centos:centos:libsoup-devel, cpe:/o:redhat:enterprise_linux:6, cpe:/o:debian:debian_linux:12.0

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 3/17/2026

Reference Information

CVE: CVE-2026-4271