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CVE-2024-27088

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

MEDIUM
5.5
CVSS Score
Published: February 26, 2024 at 04:50 PM UTC
Updated: June 17, 2026 at 07:19 AM UTC
1 product affected across 1 vendorEs5-ext

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Es5-ext· Medikoonpm
95%
v < 0.10.630.10.0 ≤ v < 0.10.63
Affected range stops below 0.10.63, so it looks safe — our inference, not a vendor statement

References (4)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/medikoo/es5-ext/commit/3551cdd7b2db08b1632841f819d008757d28e8e2
x_refsource_MISCPatch
Source: [email protected]
https://github.com/medikoo/es5-ext/commit/a52e95736690ad1d465ebcd9791d54570e294602
x_refsource_MISCExploitIssue Tracking
Source: [email protected]
https://github.com/medikoo/es5-ext/issues/201
x_refsource_CONFIRMPatchVendor Advisory
Source: [email protected]
https://github.com/medikoo/es5-ext/security/advisories/GHSA-4gmj-3p3h-gm8h

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400CWE-1333

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