CVE-2024-27088: es5-ext contains ECMAScript 5 extensions

Q: How do I fix CVE-2024-27088?

es5-ext: upgrade to 0.10.63. Exact commands for each OS are on this page.

Q: Is CVE-2024-27088 being exploited?

CVE-2024-27088 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-27088 affect?

CVE-2024-27088 affects es5-ext. Severity is none (CVSS 0.0). 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.

Q: How urgent is CVE-2024-27088?

Priority 16/100. Public exploit reference

Routine

NONE 0.0UPGRADE

CVE-2024-27088 is a none-severity flaw (CVSS 0.0) affecting es5-ext. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	0.0 (None)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-400, CWE-1333
Published	2024-02-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: medikoo

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-26 17:15 UTCPublished CVE record published
2026-06-17 07:19 UTCUpdated Record last modified

medikoo es5-ext UPGRADE

Affected: >= 0.10.0 and < 0.10.63

Fixed in: 0.10.63

Safe to downgrade to: a release before 0.10.0

1. Check installed version

npm ls es5-ext

2. UPGRADE to 0.10.63

npm install es5-ext@">=0.10.63"

3. If no update is available yet, DOWNGRADE to a release before 0.10.0

npm view es5-ext versions npm install es5-ext@"<0.10.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-27088?

es5-ext: upgrade to 0.10.63. Exact commands for each OS are on this page.

Is CVE-2024-27088 being exploited?

CVE-2024-27088 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-27088 affect?

CVE-2024-27088 affects es5-ext. Severity is none (CVSS 0.0). 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.

How urgent is CVE-2024-27088?

Priority 16/100. Public exploit reference

References

← Back to latest CVEs