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Fencer Vulns
none 0.0

CVE-2024-27088 json

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

published 2024-02-26 2 y ago modified 2026-09-10 1 mo ago also GHSA-4gmj-3p3h-gm8h , EUVD-2024-0508

cvss
0.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

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.

Patch / fix

  • npm es5-ext 0.10.63
  • medikoo es5-ext 0.10.63
  • node-es5-ext Debian 14, Debian 13 0.10.64+dfsg1+~1.1.0-1

debian advisories DEBIAN-CVE-2024-27088

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-27088 updated cvss 2.3

node-es5-ext: regular expression denial of service in `function#copy` and `function#toStringTokens`

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/medikoo/es5-ext/issues/201 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 0.0 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:N
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm es5-ext
>=0.10.0, <0.10.63
0.10.63

Affected products

  • medikoo es5-ext

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-1333 Inefficient Regular Expression Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.