CVE-2019-19919
Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.07%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 7.07% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-1321
- Affected
- handlebars.js project/handlebars.js · tenable/tenable.sc
- Source
- cve@mitre.org
EPSS 7.1% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://www.npmjs.com/advisories/1164Third Party Advisory
- https://www.tenable.com/security/tns-2021-14Patch, Third Party Advisory
- https://www.npmjs.com/advisories/1164Third Party Advisory
- https://www.tenable.com/security/tns-2021-14Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.