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Linux Distros Unpatched Vulnerability : CVE-2026-27145

high Nessus Plugin ID 318379

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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.

 - (*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, .) to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates. (CVE-2026-27145)

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-2026-27145

https://security-tracker.debian.org/tracker/CVE-2026-27145

https://ubuntu.com/security/CVE-2026-27145

Plugin Details

Severity: High

ID: 318379

File Name: unpatched_CVE_2026_27145.nasl

Version: 1.8

Type: Local

Agent: unix

Family: Misc.

Published: 6/3/2026

Updated: 7/13/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.14

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 7.2

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

CVSS Score Source: CVE-2026-27145

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.9

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

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

Vulnerability Information

CPE: cpe:/o:centos:centos:8, p-cpe:/a:canonical:ubuntu_linux:golang-1.24, p-cpe:/a:redhat:enterprise_linux:host-metering-selinux, p-cpe:/a:redhat:enterprise_linux:yggdrasil, p-cpe:/a:debian:debian_linux:golang-1.19, p-cpe:/a:redhat:enterprise_linux:golang, p-cpe:/a:redhat:enterprise_linux:golang-bin, cpe:/o:redhat:enterprise_linux:8, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:centos:centos:toolbox, p-cpe:/a:centos:centos:golang-race, p-cpe:/a:redhat:enterprise_linux:go-toolset, p-cpe:/a:redhat:enterprise_linux:host-metering, p-cpe:/a:centos:centos:golang-misc, p-cpe:/a:centos:centos:golang-src, p-cpe:/a:redhat:enterprise_linux:go-fdo-server-rendezvous, p-cpe:/a:redhat:enterprise_linux:yggdrasil-devel, p-cpe:/a:centos:centos:go-fdo-server-rendezvous, p-cpe:/a:centos:centos:golang, p-cpe:/a:centos:centos:golang-bin, p-cpe:/a:redhat:enterprise_linux:go-fdo-server, p-cpe:/a:redhat:enterprise_linux:golang-tests, p-cpe:/a:centos:centos:golang-tests, p-cpe:/a:redhat:enterprise_linux:toolbox-tests, p-cpe:/a:redhat:enterprise_linux:golang-misc, p-cpe:/a:centos:centos:host-metering-selinux, p-cpe:/a:debian:debian_linux:golang-1.24, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:centos:centos:yggdrasil, p-cpe:/a:redhat:enterprise_linux:rhc-worker-playbook, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:go-fdo-client, p-cpe:/a:centos:centos:go-fdo-server-manufacturer, p-cpe:/a:redhat:enterprise_linux:butane, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:redhat:enterprise_linux:golang-race, p-cpe:/a:redhat:enterprise_linux:toolbox, p-cpe:/a:canonical:ubuntu_linux:golang-1.26, p-cpe:/a:centos:centos:butane, p-cpe:/a:redhat:enterprise_linux:gvisor-tap-vsock, p-cpe:/a:redhat:enterprise_linux:rhc, p-cpe:/a:centos:centos:gvisor-tap-vsock-gvforwarder, p-cpe:/a:centos:centos:rhc-devel, p-cpe:/a:centos:centos:host-metering, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:centos:centos:delve, p-cpe:/a:centos:centos:go-toolset, p-cpe:/a:centos:centos:gvisor-tap-vsock, cpe:/o:debian:debian_linux:11.0, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:redhat:enterprise_linux:golang-docs, p-cpe:/a:redhat:enterprise_linux:golang-src, p-cpe:/a:centos:centos:golang-docs, p-cpe:/a:redhat:enterprise_linux:rhc-devel, p-cpe:/a:canonical:ubuntu_linux:golang-1.25, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:centos:centos:go-fdo-server, p-cpe:/a:centos:centos:go-fdo-server-owner, p-cpe:/a:centos:centos:yggdrasil-devel, p-cpe:/a:redhat:enterprise_linux:go-fdo-client, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:centos:centos:rhc, p-cpe:/a:centos:centos:rhc-worker-playbook, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:toolbox-tests, p-cpe:/a:redhat:enterprise_linux:go-fdo-server-owner, p-cpe:/a:debian:debian_linux:golang-1.15, p-cpe:/a:redhat:enterprise_linux:go-fdo-server-manufacturer, p-cpe:/a:redhat:enterprise_linux:delve, p-cpe:/a:redhat:enterprise_linux:gvisor-tap-vsock-gvforwarder

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 6/2/2026

Reference Information

CVE: CVE-2026-27145