TI-2020-18965 Aliases CVE-2020-36830 GHSA-rw72-v6c7-hf9r

nescalante urlregex Backtracking index.js redos

MEDIUM 57CWE-1333Published 2024-09-02 · Updated 2024-09-03

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00802 56th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix Fixed urlregex (npm): 0.5.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nescalante	urlregex	0.1; 0.2; 0.3; 0.4; 0.5	—	No fix listed	CNA
—	urlregex (npm)	before 0.5.1	0.5.1	Patch available	GHSA-rw72-v6c7-hf9r

urlregex Vendornescalante Affected 0.1; 0.2; 0.3; 0.4; 0.5 Fixed in — No fix listed CNA
urlregex (npm) Vendor— Affected before 0.5.1 Fixed in 0.5.1 Patch available GHSA-rw72-v6c7-hf9r

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nescalante:urlregex::::::::	before 0.5.1	Vulnerable	nescalante

cpe:2.3:a:nescalante:urlregex:*:*:*:*:*:*:*:* Versions before 0.5.1 Vulnerable ·nescalante

Remediation

Fix · GHSA-rw72-v6c7-hf9r urlregex (npm) Fixed in 0.5.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2020-36830
2026-10-03 Alias added: GHSA-rw72-v6c7-hf9r

References

Exploit 1

https://github.com/nescalante/urlregex/pull/8

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2020-36830

Other 1

https://github.com/nescalante/urlregex

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences