path-to-regexp up to 8.3.x redos

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in path-to-regexp up to 8.3.x. This vulnerability affects unknown code. This manipulation causes redos. The identification of this vulnerability is CVE-2026-4923. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in path-to-regexp up to 8.3.x. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability. The summary by CVE is:

Impact: When using multiple wildcards, combined with at least one parameter, a regular expression can be generated that is vulnerable to ReDoS. This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path. Unsafe examples: /*foo-*bar-:baz /*a-:b-*c-:d /x/*a-:b/*c/y Safe examples: /*foo-:bar /*foo-:bar-*baz Patches: Upgrade to version 8.4.0. Workarounds: If you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.

It is possible to read the advisory at cna.openjsf.org. This vulnerability is known as CVE-2026-4923 since 03/26/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1449.003 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 303924 (Linux Distros Unpatched Vulnerability : CVE-2026-4923), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.4.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (303924), EUVD (EUVD-2026-16322) and CERT Bund (WID-SEC-2026-1407). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • IBM App Connect Enterprise
  • Red Hat Enterprise Linux
  • Fedora Linux
  • IBM QRadar SIEM
  • IBM MQ
  • IBM Maximo Asset Management
  • IBM Sterling Connect:Direct

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.9
CNA Vector (openjs): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Redos
CWE: CWE-1333 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303924
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-4923

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: path-to-regexp 8.4.0

Timelineinfo

03/26/2026 Advisory disclosed
03/26/2026 +0 days CVE reserved
03/26/2026 +0 days VulDB entry created
06/20/2026 +85 days VulDB entry last update

Sourcesinfo

Advisory: cna.openjsf.org
Status: Confirmed

CNA: openjs
CVE: CVE-2026-4923 (🔒)

GCVE (CVE): GCVE-0-2026-4923
GCVE (VulDB): GCVE-100-353719
EUVD: 🔒
CERT Bund: WID-SEC-2026-1407 - IBM App Connect Enterprise Certified Container: Mehrere Schwachstellen

Entryinfo

Created: 03/26/2026 22:59
Updated: 06/20/2026 01:33
Changes: 03/26/2026 22:59 (62), 03/27/2026 12:51 (2), 03/28/2026 04:36 (1), 05/08/2026 01:39 (7), 06/20/2026 01:33 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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