GHSA-X7J8-49R8-MR43
Vulnerability from github – Published: 2026-05-21 21:41 – Updated: 2026-05-21 21:41
VLAI
Summary
@nevware21/ts-utils: Prototype Pollution in objDeepCopy/objCopyProps via for...in without hasOwnProperty
Details
Summary
The _copyProps function in lib/src/object/copy.ts uses for...in to iterate over source object properties without an Object.hasOwnProperty check, and does not filter dangerous keys (proto, constructor, prototype). This allows an attacker to pollute the prototype chain of all objects in the application.
Details
In _copyProps() (copy.ts lines 186-191), the code iterates all enumerable properties including inherited ones and dangerous keys like proto. Any object with a proto key (e.g., from untrusted JSON input) will overwrite the target's prototype.
PoC
const malicious = JSON.parse('{"__proto__": {"polluted": true}}');
objDeepCopy(malicious);
console.log({}.polluted); // true
Suggested Fix
Add objHasOwnProperty check and filter proto, constructor, prototype keys.
Severity
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.13.0"
},
"package": {
"ecosystem": "npm",
"name": "@nevware21/ts-utils"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.14.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-46681"
],
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-21T21:41:36Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "## Summary\n\nThe _copyProps function in lib/src/object/copy.ts uses for...in to iterate over source object properties without an Object.hasOwnProperty check, and does not filter dangerous keys (__proto__, constructor, prototype). This allows an attacker to pollute the prototype chain of all objects in the application.\n\n## Details\n\nIn _copyProps() (copy.ts lines 186-191), the code iterates all enumerable properties including inherited ones and dangerous keys like __proto__. Any object with a __proto__ key (e.g., from untrusted JSON input) will overwrite the target\u0027s prototype.\n\n## PoC\n```\nconst malicious = JSON.parse(\u0027{\"__proto__\": {\"polluted\": true}}\u0027);\nobjDeepCopy(malicious);\nconsole.log({}.polluted); // true\n```\n## Suggested Fix\n\nAdd objHasOwnProperty check and filter __proto__, constructor, prototype keys.",
"id": "GHSA-x7j8-49r8-mr43",
"modified": "2026-05-21T21:41:36Z",
"published": "2026-05-21T21:41:36Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/nevware21/ts-utils/security/advisories/GHSA-x7j8-49r8-mr43"
},
{
"type": "PACKAGE",
"url": "https://github.com/nevware21/ts-utils"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "@nevware21/ts-utils: Prototype Pollution in objDeepCopy/objCopyProps via for...in without hasOwnProperty"
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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