What’s Vulnerable › Vulnerabilities

CVE-2020-36830: nescalante urlregex Backtracking index.js redos

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-09-02 · updated 2026-06-17
• Weakness: CWE-1333

Description

A vulnerability was found in nescalante urlregex up to 0.5.0 and classified as problematic. This issue affects some unknown processing of the file index.js of the component Backtracking. The manipulation leads to inefficient regular expression complexity. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 0.5.1 is able to address this issue. The identifier of the patch is e5a085afe6abfaea1d1a78f54c45af9ef43ca1f9. It is recommended to upgrade the affected component.

Affected products

• nescalante urlregex: before 0.5.1 — fixed in 0.5.1

How to fix

Upgrade to a fixed version: nescalante urlregex 0.5.1. Check the vendor advisory for mitigations.

References

• https://github.com/nescalante/urlregex/commit/e5a085afe6abfaea1d1a78f54c45af9ef43ca1f9
• https://github.com/nescalante/urlregex/pull/8
• https://github.com/nescalante/urlregex/releases/tag/v0.5.1
• https://vuldb.com/?ctiid.276269
• https://vuldb.com/?id.276269

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