# Handlebars vulnerabilities

Source: https://junglewise.ai/threats/technologies/handlebars-handlebars  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/handlebars-handlebars.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 9 vulnerabilities in Handlebars: 0 in the last 7 days and 1 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-106445, was published on 6 October 2026. Nothing in the last four weeks, down from 1 vulnerability in the four before. 0 critical against 1.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 9 (1 critical, 0 exploited in the wild)

## About Handlebars

JavaScript templating language and engine for generating dynamic HTML and text content.

## Latest Handlebars vulnerabilities

- [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)
- [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-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 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)
- [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-2026-106445: 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-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 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)
- [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 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 arbitrary code execution via lookup helper](https://junglewise.ai/threats/handlebars-arbitrary-code-execution-via-lookup-helper-739dd450) (info, 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)
- [Handlebars moderate severity vulnerability (withdrawn)](https://junglewise.ai/threats/handlebars-moderate-severity-vulnerability-withdrawn-cad4e97e) (info, published 24 Oct 2017)

## Vulnerabilities per week

Nothing in the last four weeks, down from 1 vulnerability in the four before. 0 critical against 1.

| 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 | 1 | 1 | 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 |

## Other Handlebars technologies

- [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/technologies/handlebars-handlebars, 9 November 2026.