# Handlebars vulnerabilities Source: https://junglewise.ai/threats/vendors/handlebars Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/vendors/handlebars.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 17 vulnerabilities in Handlebars: 0 in the last 7 days and 3 in the last 90 days, 3 of them critical and 0 exploited in the wild. The most recent, CVE-2026-106446, was published on 6 October 2026. Nothing in the last four weeks, down from 3 vulnerabilities in the four before. 0 critical against 2. 2 technologies have a page of their own. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 3 - All time: 17 (3 critical, 0 exploited in the wild) ## About Handlebars JavaScript templating engine and library for rendering dynamic content. ## Latest Handlebars vulnerabilities - [CVE-2026-106446: Handlebars AST validation bypass in compile and precompile](https://junglewise.ai/threats/cve-2026-106446-handlebars-provides-the-power-necessary-to-let-users-build) (critical, CVSS 9.8, published 6 Oct 2026) - [CVE-2026-106445: Handlebars prototype pollution RCE via constructor bypass](https://junglewise.ai/threats/cve-2026-106445-handlebars-provides-the-power-necessary-to-let-users-build) (critical, CVSS 4, published 6 Oct 2026) - [CVE-2026-106444: Handlebars precompile script injection in generated code](https://junglewise.ai/threats/cve-2026-106444-handlebars-provides-the-power-necessary-to-let-users-build) (medium, CVSS 4.7, published 6 Oct 2026) - [Handlebars.js prototype method access control gap via missing __lookupSetter__](https://junglewise.ai/threats/handlebars-js-prototype-method-access-control-gap-via-missing-f97c2407) (low, CVSS 3.1, published 29 Mar 2026) - [Handlebars.js property access validation bypass in container.lookup](https://junglewise.ai/threats/handlebars-js-property-access-validation-bypass-in-container-lookup-25bcfec0) (low, CVSS 3.1, published 29 Mar 2026) - [CVE-2026-33938: Handlebars.js remote code execution via @partial-block AST injection](https://junglewise.ai/threats/cve-2026-33938-handlebars-js-remote-code-execution-via-partial-block-ast) (high, CVSS 8.1, published 27 Mar 2026) - [CVE-2026-33937: Handlebars.js remote code execution via AST type confusion in compile](https://junglewise.ai/threats/cve-2026-33937-handlebars-js-remote-code-execution-via-ast-type-confusion-in) (critical, CVSS 9.8, published 27 Mar 2026) - [CVE-2021-23383: Handlebars prototype pollution in template compilation](https://junglewise.ai/threats/cve-2021-23383-handlebars-prototype-pollution-in-template-compilation) (low, CVSS 3.1, published 10 Feb 2022) - [CVE-2019-20922: Handlebars regular expression denial of service](https://junglewise.ai/threats/cve-2019-20922-handlebars-regular-expression-denial-of-service) (low, CVSS 3.1, published 10 Feb 2022) - [CVE-2021-23369: Handlebars remote code execution in template compilation](https://junglewise.ai/threats/cve-2021-23369-handlebars-remote-code-execution-in-template-compilation) (low, CVSS 3.1, published 6 May 2021) - [Handlebars arbitrary code execution via lookup helper](https://junglewise.ai/threats/handlebars-arbitrary-code-execution-via-lookup-helper-739dd450) (info, published 4 Sep 2020) - [Handlebars prototype pollution in template processing](https://junglewise.ai/threats/handlebars-prototype-pollution-in-template-processing-676d30e6) (info, CVSS 7.5, published 4 Sep 2020) - [Handlebars Denial of Service in template parser](https://junglewise.ai/threats/handlebars-denial-of-service-in-template-parser-7f538b11) (info, published 3 Sep 2020) - [CVE-2019-19919: Handlebars prototype pollution remote code execution](https://junglewise.ai/threats/cve-2019-19919-handlebars-prototype-pollution-remote-code-execution) (low, CVSS 3.1, published 26 Dec 2019) - [Handlebars.js remote code execution via template injection](https://junglewise.ai/threats/handlebars-js-remote-code-execution-via-template-injection-c5d2b812) (info, published 15 Jul 2019) - [Handlebars prototype pollution remote code execution](https://junglewise.ai/threats/handlebars-prototype-pollution-remote-code-execution-cfff4bd0) (low, CVSS 3.1, published 5 Jun 2019) - [Handlebars moderate severity vulnerability (withdrawn)](https://junglewise.ai/threats/handlebars-moderate-severity-vulnerability-withdrawn-cad4e97e) (info, published 24 Oct 2017) ## Most severe Handlebars vulnerabilities - [CVE-2026-33937: Handlebars.js remote code execution via AST type confusion in compile](https://junglewise.ai/threats/cve-2026-33937-handlebars-js-remote-code-execution-via-ast-type-confusion-in) (critical, CVSS 9.8, published 27 Mar 2026) - [CVE-2026-106446: Handlebars AST validation bypass in compile and precompile](https://junglewise.ai/threats/cve-2026-106446-handlebars-provides-the-power-necessary-to-let-users-build) (critical, CVSS 9.8, published 6 Oct 2026) - [CVE-2026-106445: Handlebars prototype pollution RCE via constructor bypass](https://junglewise.ai/threats/cve-2026-106445-handlebars-provides-the-power-necessary-to-let-users-build) (critical, CVSS 4, published 6 Oct 2026) - [CVE-2026-33938: Handlebars.js remote code execution via @partial-block AST injection](https://junglewise.ai/threats/cve-2026-33938-handlebars-js-remote-code-execution-via-partial-block-ast) (high, CVSS 8.1, published 27 Mar 2026) - [CVE-2026-106444: Handlebars precompile script injection in generated code](https://junglewise.ai/threats/cve-2026-106444-handlebars-provides-the-power-necessary-to-let-users-build) (medium, CVSS 4.7, published 6 Oct 2026) - [CVE-2019-19919: Handlebars prototype pollution remote code execution](https://junglewise.ai/threats/cve-2019-19919-handlebars-prototype-pollution-remote-code-execution) (low, CVSS 3.1, published 26 Dec 2019) - [CVE-2021-23369: Handlebars remote code execution in template compilation](https://junglewise.ai/threats/cve-2021-23369-handlebars-remote-code-execution-in-template-compilation) (low, CVSS 3.1, published 6 May 2021) - [CVE-2021-23383: Handlebars prototype pollution in template compilation](https://junglewise.ai/threats/cve-2021-23383-handlebars-prototype-pollution-in-template-compilation) (low, CVSS 3.1, published 10 Feb 2022) - [CVE-2019-20922: Handlebars regular expression denial of service](https://junglewise.ai/threats/cve-2019-20922-handlebars-regular-expression-denial-of-service) (low, CVSS 3.1, published 10 Feb 2022) - [Handlebars.js prototype method access control gap via missing __lookupSetter__](https://junglewise.ai/threats/handlebars-js-prototype-method-access-control-gap-via-missing-f97c2407) (low, CVSS 3.1, published 29 Mar 2026) ## Vulnerabilities per week Nothing in the last four weeks, down from 3 vulnerabilities in the four before. 0 critical against 2. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 3 | 2 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Handlebars technologies - [Handlebars](https://junglewise.ai/threats/technologies/handlebars-handlebars): 9 vulnerabilities - [Handlebars.js](https://junglewise.ai/threats/technologies/handlebars-handlebars-js): 4 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Handlebars vulnerabilities", https://junglewise.ai/threats/vendors/handlebars, 9 November 2026.