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CVE-2026-4923— path-to-regexp vulnerable to Regular Expression Denial of Service via multiple wildcards

Quick assessment

Affected
path-to-regexp path-to-regexp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Path-to-RegExp是pillarjs开源的一个工具。用于将路径字符串转换为正则表达式。 path-to-regexp 8.4.0之前版本存在安全漏洞，该漏洞源于使用多个通配符和参数时生成的正则表达式存在缺陷，可能导致正则表达式拒绝服务。

CVSS 5.9 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-4923

Vulnerability Information
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Vulnerability Title
path-to-regexp vulnerable to Regular Expression Denial of Service via multiple wildcards
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Path-to-RegExp 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Path-to-RegExp是pillarjs开源的一个工具。用于将路径字符串转换为正则表达式。 path-to-regexp 8.4.0之前版本存在安全漏洞，该漏洞源于使用多个通配符和参数时生成的正则表达式存在缺陷，可能导致正则表达式拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
path-to-regexp path-to-regexp 8.0.0 ~ 8.4.0 -

II. Public POCs for CVE-2026-4923

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III. Intelligence Information for CVE-2026-4923

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Same Patch Batch · path-to-regexp · 2026-03-26 · 3 CVEs total

CVE-2026-4867 7.5 HIGH path-to-regexp vulnerable to Regular Expression Denial of Service via multiple route param
CVE-2026-4926 7.5 HIGH path-to-regexp vulnerable to Denial of Service via sequential optional groups

IV. Related Vulnerabilities

Same product: path-to-regexp
Same vendor: path-to-regexp
Same weakness: CWE-1333

V. Comments for CVE-2026-4923

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