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Linux Distros Unpatched Vulnerability : CVE-2026-27601

high Nessus Plugin ID 300943

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.

 - Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the case of _.flatten, the vulnerability can only be exploited if it is possible for a remote client to prepare a datastructure that consists of arrays at all levels AND if no finite depth limit is passed as the second argument to
 _.flatten. In the case of _.isEqual, the vulnerability can only be exploited if there exists a code path in which two distinct datastructures that were submitted by the same remote client are compared using
 _.isEqual. For example, if a client submits data that are stored in a database, and the same client can later submit another datastructure that is then compared to the data that were saved in the database previously, OR if a client submits a single request, but its data are parsed twice, creating two non- identical but equivalent datastructures that are then compared. Exceptions originating from the call to
 _.flatten or _.isEqual, as a result of a stack overflow, are not being caught. This vulnerability is fixed in 1.13.8. (CVE-2026-27601)

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-2026-27601

https://security-tracker.debian.org/tracker/CVE-2026-27601

https://ubuntu.com/security/CVE-2026-27601

Plugin Details

Severity: High

ID: 300943

File Name: unpatched_CVE_2026_27601.nasl

Version: 1.2

Type: local

Agent: unix

Family: Misc.

Published: 3/5/2026

Updated: 3/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.5

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

CVSS Score Source: CVE-2026-27601

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7.1

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:P/RL:U/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 6.9

Threat Vector: CVSS:4.0/E:P

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:debian:debian_linux:11.0, p-cpe:/a:centos:centos:firefox-x11, p-cpe:/a:centos:centos:dotnet-sdk-7.0-source-built-artifacts, p-cpe:/a:centos:centos:grafana-influxdb, p-cpe:/a:redhat:enterprise_linux:grafana-opentsdb, p-cpe:/a:centos:centos:grafana-mysql, p-cpe:/a:redhat:enterprise_linux:dotnet-hostfxr-7.0, p-cpe:/a:centos:centos:grafana-selinux, p-cpe:/a:centos:centos:grafana-graphite, cpe:/o:debian:debian_linux:14.0, p-cpe:/a:redhat:enterprise_linux:gjs-devel, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:centos:centos:grafana-prometheus, p-cpe:/a:centos:centos:grafana-stackdriver, p-cpe:/a:redhat:enterprise_linux:gjs, p-cpe:/a:redhat:enterprise_linux:thunderbird, p-cpe:/a:centos:centos:aspnetcore-targeting-pack-7.0, p-cpe:/a:redhat:enterprise_linux:grafana-stackdriver, p-cpe:/a:redhat:enterprise_linux:grafana-loki, p-cpe:/a:redhat:enterprise_linux:dotnet-sdk-7.0, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:python3-sphinx-latex, p-cpe:/a:redhat:enterprise_linux:netstandard-targeting-pack-2.1, p-cpe:/a:centos:centos:grafana-mssql, p-cpe:/a:debian:debian_linux:underscore, p-cpe:/a:centos:centos:gjs, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:redhat:enterprise_linux:grafana-azure-monitor, p-cpe:/a:centos:centos:dotnet-templates-7.0, p-cpe:/a:centos:centos:thunderbird, cpe:/o:centos:centos:8, p-cpe:/a:redhat:enterprise_linux:dotnet7.0, p-cpe:/a:centos:centos:dotnet-apphost-pack-7.0, p-cpe:/a:centos:centos:python-sphinx-doc, p-cpe:/a:redhat:enterprise_linux:aspnetcore-runtime-7.0, p-cpe:/a:redhat:enterprise_linux:grafana-influxdb, p-cpe:/a:centos:centos:grafana-azure-monitor, p-cpe:/a:centos:centos:grafana-loki, p-cpe:/a:canonical:ubuntu_linux:ruby-rails-assets-underscore, p-cpe:/a:redhat:enterprise_linux:dotnet-templates-7.0, p-cpe:/a:redhat:enterprise_linux:grafana-mssql, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:centos:centos:dotnet-targeting-pack-7.0, p-cpe:/a:redhat:enterprise_linux:dotnet-host, p-cpe:/a:redhat:enterprise_linux:grafana-cloudwatch, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:redhat:enterprise_linux:dotnet-apphost-pack-7.0, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:redhat:enterprise_linux:python3-sphinx, p-cpe:/a:redhat:enterprise_linux:python3-sphinx-latex, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:centos:centos:dotnet7.0, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:grafana, p-cpe:/a:centos:centos:grafana-elasticsearch, p-cpe:/a:redhat:enterprise_linux:dotnet-runtime-7.0, p-cpe:/a:redhat:enterprise_linux:dotnet-sdk-7.0-source-built-artifacts, p-cpe:/a:centos:centos:aspnetcore-runtime-7.0, p-cpe:/a:centos:centos:dotnet-host, p-cpe:/a:centos:centos:dotnet-runtime-7.0, p-cpe:/a:redhat:enterprise_linux:firefox, p-cpe:/a:centos:centos:grafana-cloudwatch, p-cpe:/a:redhat:enterprise_linux:dotnet-targeting-pack-7.0, p-cpe:/a:centos:centos:mozjs60-devel, p-cpe:/a:centos:centos:dotnet-hostfxr-7.0, p-cpe:/a:centos:centos:mozjs60, p-cpe:/a:centos:centos:grafana, p-cpe:/a:redhat:enterprise_linux:mozjs60, p-cpe:/a:redhat:enterprise_linux:grafana-elasticsearch, p-cpe:/a:centos:centos:gjs-devel, p-cpe:/a:redhat:enterprise_linux:grafana-graphite, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:redhat:enterprise_linux:grafana-postgres, p-cpe:/a:redhat:enterprise_linux:grafana-prometheus, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:redhat:enterprise_linux:grafana-selinux, p-cpe:/a:redhat:enterprise_linux:firefox-x11, p-cpe:/a:redhat:enterprise_linux:grafana-mysql, p-cpe:/a:redhat:enterprise_linux:aspnetcore-targeting-pack-7.0, p-cpe:/a:centos:centos:grafana-postgres, p-cpe:/a:centos:centos:dotnet-sdk-7.0, p-cpe:/a:centos:centos:netstandard-targeting-pack-2.1, p-cpe:/a:centos:centos:firefox, p-cpe:/a:centos:centos:grafana-opentsdb, p-cpe:/a:redhat:enterprise_linux:mozjs60-devel, p-cpe:/a:redhat:enterprise_linux:python-sphinx-doc, p-cpe:/a:centos:centos:python3-sphinx

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: 3/3/2026

Reference Information

CVE: CVE-2026-27601