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CVE-2024-27088

MediumPublished

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

Published: Feb 26, 2024
Updated: Aug 9, 2024
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

5.5/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 43.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

CVE-2024-27088PoC
redos

Responsible use

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