Critical
Security advisory
Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Object's __proto__ and __defineGetter__ properties, which may allow an attacker to execute arbitrary code through crafted payloads.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-19919
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:05 UTC · Revision 1
Source evidence
Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Object's __proto__ and __defineGetter__ properties, which may allow an attacker to execute arbitrary code through crafted payloads.
osv:CVE-2019-19919
Complete source record
{
"id": "eca3af6b96635c541ac998738065e498d43ed870b099e9b1cefdf61f5f31e7f5",
"url": "https://osv.dev/vulnerability/CVE-2019-19919",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-19919",
"summary": "Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Object's __proto__ and __defineGetter__ properties, which may allow an attacker to execute arbitrary code through crafted payloads.",
"evidence": "osv:CVE-2019-19919",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2019-19919",
"aliases": [
"CVE-2019-19919",
"GHSA-w457-6q6x-cgp9"
],
"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
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],
"modified": "2026-10-24T10:31:02.781723518Z",
"provider": "osv",
"references": [
"https://www.npmjs.com/advisories/1164",
"https://www.tenable.com/security/tns-2021-14"
],
"provider_metadata": {
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"related_cves": [
{
"value": "CVE-2019-19919",
"evidence": "/id"
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"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 440095,
"published_at": "2019-12-20T23:15:11.48+00:00"
}