How severe is CVE-2024-27088?

CVE-2024-27088 has a CVSS score of 0/10, rated NONE. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2024-27088?

CVE-2024-27088 affects the following packages: es5-ext (npm). Ecosystems affected: npm.

How do I fix CVE-2024-27088?

Update es5-ext to 0.10.63 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-27088 is resolved across your whole dependency graph.

How do I detect CVE-2024-27088 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for es5-ext. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate CVE-2024-27088 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2024-27088?

O3 pinpoints whether CVE-2024-27088 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is CVE-2024-27088 actively exploited in the wild?

No public exploit code has been indexed for CVE-2024-27088 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2024-27088?

CVE-2024-27088 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 41th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was CVE-2024-27088 published, and has it been updated?

CVE-2024-27088 was published on February 26, 2024 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

CVE-2024-27088

NONE

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

Also known asGHSA-4gmj-3p3h-gm8h

Published

Feb 26, 2024

Updated

Apr 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk41th percentile-1.47%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

📦es5-ext

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`es5-ext`	≥ 0.10.0&&< 0.10.63	0.10.63

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for es5-ext. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update es5-ext to 0.10.63 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-27088 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2024-27088 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2024-27088. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2024-27088 in your dependencies?

O3 detects CVE-2024-27088 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works