Linux Distros Unpatched Vulnerability : CVE-2026-4867

high Nessus Plugin ID 303899

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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.

- Impact: A bad regular expression is generated any time you have three or more parameters within a single segment, separated by something that is not a period (.). For example, /:a-:b-:c or /:a-:b-:c-:d. The backtrack protection added in [email protected] only prevents ambiguity for two parameters. With three or more, the generated lookahead does not block single separator characters, so capture groups overlap and cause catastrophic backtracking. Patches: Upgrade to [email protected] Custom regex patterns in route definitions (e.g., /:a-:b([^-/]+)-:c([^-/]+)) are not affected because they override the default capture group. Workarounds: All versions can be patched by providing a custom regular expression for parameters after the first in a single segment. As long as the custom regular expression does not match the text before the parameter, you will be safe. For example, change /:a-:b-:c to /:a-:b([^-/]+)-:c([^-/]+). If paths cannot be rewritten and versions cannot be upgraded, another alternative is to limit the URL length.
(CVE-2026-4867)

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: 303899

File Name: unpatched_CVE_2026_4867.nasl

Version: 1.3

Type: Local

Agent: unix

Family: Misc.

Published: 3/26/2026

Updated: 3/30/2026

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-2026-4867

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: p-cpe:/a:redhat:enterprise_linux:sgx-libs, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:centos:centos:mozjs60-devel, p-cpe:/a:centos:centos:gjs-devel, p-cpe:/a:redhat:enterprise_linux:sgx-common, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:centos:centos:sgx-pckid-tool, p-cpe:/a:canonical:ubuntu_linux:node-path-to-regexp, p-cpe:/a:redhat:enterprise_linux:sgx-mpa, p-cpe:/a:redhat:enterprise_linux:gjs-devel, p-cpe:/a:centos:centos:tdx-qgs, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:redhat:enterprise_linux:gjs, p-cpe:/a:centos:centos:gjs, p-cpe:/a:redhat:enterprise_linux:pcs-snmp, p-cpe:/a:centos:centos:sgx-libs, p-cpe:/a:redhat:enterprise_linux:tdx-qgs, p-cpe:/a:centos:centos:sgx-mpa, p-cpe:/a:redhat:enterprise_linux:pcs, p-cpe:/a:redhat:enterprise_linux:mozjs60, p-cpe:/a:redhat:enterprise_linux:sgx-pckid-tool, cpe:/o:redhat:enterprise_linux:9, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:mozjs60, p-cpe:/a:centos:centos:sgx-common, p-cpe:/a:redhat:enterprise_linux:mozjs60-devel, p-cpe:/a:centos:centos:pcs, p-cpe:/a:centos:centos:pcs-snmp

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: 3/26/2026

Reference Information

CVE: CVE-2026-4867

Detections

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