path-to-regexp up to 8.3.x resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in path-to-regexp up to 8.3.x. This issue affects some unknown processing. Such manipulation leads to resource consumption. This vulnerability is referenced as CVE-2026-4926. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in path-to-regexp up to 8.3.x. Affected by this issue is an unknown part. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

Impact: A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service. Patches: Fixed in version 8.4.0. Workarounds: Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.

The advisory is shared for download at cna.openjsf.org. This vulnerability is handled as CVE-2026-4926 since 03/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 303925 (Linux Distros Unpatched Vulnerability : CVE-2026-4926), 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 (303925), EUVD (EUVD-2026-16324) and CERT Bund (WID-SEC-2026-1407). VulDB is the best source for vulnerability data and more expert information about this specific topic.

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: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (openjs): 🔒

CVSSv2info

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

Exploitinginfo

Class: Resource consumption
CWE: 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: 303925
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-4926

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
07/01/2026 +97 days VulDB entry last update

Sourcesinfo

Advisory: cna.openjsf.org
Status: Confirmed

CVE: CVE-2026-4926 (🔒)
GCVE (CVE): GCVE-0-2026-4926
GCVE (VulDB): GCVE-100-353720
EUVD: 🔒
CERT Bund: WID-SEC-2026-1407 - IBM App Connect Enterprise Certified Container: Mehrere Schwachstellen

Entryinfo

Created: 03/26/2026 23:00
Updated: 07/01/2026 23:35
Changes: 03/26/2026 23:00 (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), 07/01/2026 23:35 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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