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es5-ext vulnerable to Regular Expression Denial of Service in `function#copy` and `function#toStringTokens`GHSA-4gmj-3p3h-gm8h

Fix: medikoo/es5-ext@3551cdd

GHSA-4gmj-3p3h-gm8h is a Uncontrolled Resource Consumption vulnerability in es5-ext. A fix is available for es5-ext — see the affected versions and patch details below.

Also known asCVE-2024-27088
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-4gmj-3p3h-gm8h.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk+0.00%
Lower risk than most CVEs46th percentile — riskier than 46% of all scored CVEsHighest risk
0.03%0.86%1.68%2.50%2.0%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

285other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
es5-extnpm
15.7Mdownloads / week

Description

Impact

Passing functions with very long names or complex default argument names into function#copy orfunction#toStringTokens may put script to stall

Patches

Fixed with https://github.com/medikoo/es5-ext/commit/3551cdd7b2db08b1632841f819d008757d28e8e2 and https://github.com/medikoo/es5-ext/commit/a52e95736690ad1d465ebcd9791d54570e294602 Published with v0.10.63

Workarounds

No real workaround aside of refraining from using above utilities.

References

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmes5-ext≥ 0.10.0&&< 0.10.630.10.63npm install es5-ext@0.10.63

Affected Products

1 product · 1 configurations
Application
es5-extmedikoo
≥ 0.10.0 && < 0.10.63
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for es5-ext, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update es5-ext to 0.10.63 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4gmj-3p3h-gm8h is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Impact Passing functions with very long names or complex default argument names into `function#copy` or`function#toStringTokens` may put script to stall ### Patches Fixed with https://github.com/medikoo/es5-ext/commit/3551cdd7b2db08b1632841f819d008757d28e8e2 and https://github.com/medikoo/es5-ext/commit/a52e95736690ad1d465ebcd9791d54570e294602 Published with v0.10.63 ### Workarounds No real workaround aside of refraining from using above utilities. ### References https://github.com/medikoo/es5-ext/issues/201
O3 Security · Impact-Aware SCA

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es5-ext vulnerable to Regular Expression Denial of Service…