TI-2024-17950 Aliases CVE-2024-27088 GHSA-4gmj-3p3h-gm8h

es5-ext Regular Expression Denial of Service in `function#copy` and `function#toStringTokens`

LOW 26CWE-1333Published 2024-02-26 · Updated 2024-08-09

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

es5-ext contains ECMAScript 5 extensions. Passing functions with very long names or complex default argument names into `function#copy` or `function#toStringTokens` may cause the script to stall. The vulnerability is patched in v0.10.63.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00539 45th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed es5-ext (medikoo): 0.10.63es5-ext (npm): 0.10.63

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
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
medikoo	es5-ext	0.10.0 to before 0.10.63	0.10.63	Patch available	CNA
—	es5-ext (npm)	0.10.0 to before 0.10.63	0.10.63	Patch available	GHSA-4gmj-3p3h-gm8h

es5-ext Vendormedikoo Affected 0.10.0 to before 0.10.63 Fixed in 0.10.63 Patch available CNA
es5-ext (npm) Vendor— Affected 0.10.0 to before 0.10.63 Fixed in 0.10.63 Patch available GHSA-4gmj-3p3h-gm8h

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:medikoo:es5-ext::::::node.js::*	0.10.0 to before 0.10.63	Vulnerable	medikoo

cpe:2.3:a:medikoo:es5-ext:*:*:*:*:*:node.js:*:* Versions 0.10.0 to before 0.10.63 Vulnerable ·medikoo

Remediation

Fix · CNA es5-ext (medikoo) Fixed in 0.10.63
Fix · GHSA-4gmj-3p3h-gm8h es5-ext (npm) Fixed in 0.10.63 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2024-27088
2026-10-03 Alias added: GHSA-4gmj-3p3h-gm8h

References

Exploit 1

https://github.com/medikoo/es5-ext/issues/201

Patch 3

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2024-27088

Other 1

https://github.com/medikoo/es5-ext

Sources

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