Linux Distros Unpatched Vulnerability : CVE-2026-76151

high Nessus Plugin ID 348709

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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.

- Out-of-bounds read (buffer over-read) in the HTTP Cache-Control response header parsing in the QtNetwork module in Qt Group Qt 6.0.0 through 6.8.8, and 6.9.0 through 6.11.1, allows remote attackers to cause a denial of service (application crash) via an excessively large Cache-Control header value returned by an untrusted or compromised HTTP server to an application using QNetworkAccessManager. Only the client side of the connection is affected and 32-bit builds are not affected; the out-of-bounds access is read-only, with no information disclosure and no code execution. (CVE-2026-76151)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 348709

File Name: unpatched_CVE_2026_76151.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 9/22/2026

Updated: 10/31/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.5

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.9

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

CVSS Score Source: CVE-2026-76151

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.3

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

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

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 4.6

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.10, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:canonical:ubuntu_linux:qt6-base, p-cpe:/a:canonical:ubuntu_linux:qtbase-opensource-src, p-cpe:/a:debian:debian_linux:qt6-base, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-common, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-devel, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-examples, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-gui, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-mysql, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-odbc, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-postgresql, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-private-devel, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase-static, p-cpe:/a:redhat:enterprise_linux:qt6-qtbase

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: 9/16/2026

Reference Information

CVE: CVE-2026-76151

Detections

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