CVE-2026-106445
Fixed in a distro release EPSS <1%CVSS 9.2
Handlebars provides the power necessary to let users build semantic templates. From 3.0.0 until 4.7.10, Handlebars lookupProperty returns Function.prototype.constructor before applying the prototype-access deny list because constructor is an own property of Function.prototype. When an attacker can render a controlled template with allowProtoMethodsByDefault enabled and an accessible function in the template context, the template can traverse from that function through its prototype to Function.prototype and then obtain the Function constructor through the own-property bypass. This permits attacker-controlled JavaScript to execute with the server application's privileges. This issue is fixed in version 4.7.10.
Products: handlebars-lang handlebars.js
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| npm | handlebars | 4.7.10 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | eco-jess | no fix |
| Chainguard | gitlab-rails-ce-18.11 | 18.11.13-r0 |
| Chainguard | gitlab-rails-ce-18.8 | no fix |
| Chainguard | gitlab-rails-ce-18.9 | no fix |
| Chainguard | gitlab-rails-ce-assets-fips-19.4 | 0 |
| Chainguard | gitlab-rails-ce-assets-fips-19.5 | 0 |
| Chainguard | gitlab-rails-ce-fips-18.8 | no fix |
| Chainguard | kibana-8.19 | 8.19.23-r3 |
| Chainguard | kibana-8.19-bitnami | 8.19.23-r3 |
| Chainguard | kibana-9.2 | no fix |
| Chainguard | kibana-9.3 | no fix |
| Chainguard | kibana-9.4 | 9.4.7-r8 |
| Chainguard | kibana-9.5 | 9.5.4-r7 |
| Chainguard | langfuse-4-worker | 4.56.0-r0 |
| Chainguard | langfuse-fips-4-worker | 4.49.0-r5 |
| Chainguard | lerna | 10.0.1-r10 |
| Chainguard | librechat | 0.8.8-r2 |
| Chainguard | nextcloud-server-33 | 33.0.9-r7 |
| Chainguard | opensearch-dashboards-2 | 2.19.6-r28 |
| Chainguard | opensearch-dashboards-2-fips | 2.19.6-r14 |
| Chainguard | opensearch-dashboards-3 | 3.8.0-r13 |
| Chainguard | opensearch-dashboards-3-fips | 3.8.0-r8 |
| Chainguard | pelias-api | 7.11.0-r2 |
| Chainguard | prism | 5.16.0-r16 |
| Chainguard | rancher-api-ui | 1.2.3-r15 |
| Chainguard | renovate | 44.133.0-r5 |
| Chainguard | tileserver-gl | 5.6.0-r20 |
| Chainguard | tileserver-gl-fips | 5.6.0-r19 |
| Chainguard | ts-patch | 4.0.1-r48 |
| Chainguard | verdaccio | 6.10.5-r4 |
| Chainguard | wazuh-dashboard | 4.14.8-r9 |
| Chainguard | wazuh-dashboard-dashboards-reporting | 4.14.8-r9 |
| Chainguard | wazuh-dashboard-dashboards-reporting-fips | 4.14.8-r9 |
| Chainguard | wazuh-dashboard-fips | 4.14.8-r9 |
| Chainguard | wazuh-dashboard-security-plugin | 4.14.8-r9 |
| Chainguard | wazuh-dashboard-security-plugin-fips | 4.14.8-r9 |
| Debian 12 | node-handlebars | no fix |
| Debian 13 | node-handlebars | no fix |
| Debian 14 | node-handlebars | 3:4.7.10-1 |
| Ubuntu 18.04 LTS | node-handlebars | no fix |
| Ubuntu 20.04 LTS | node-handlebars | no fix |
| Ubuntu 22.04 LTS | node-handlebars | no fix |
| Ubuntu 24.04 LTS | node-handlebars | no fix |
| Ubuntu 26.04 LTS | node-handlebars | no fix |
| Ubuntu 26.10 | node-handlebars | no fix |
| Wolfi | lerna | 10.0.1-r10 |
| Wolfi | nextcloud-server-33 | 33.0.9-r7 |
| Wolfi | opensearch-dashboards-3 | 3.8.0-r13 |
| Wolfi | prism | 5.16.0-r16 |
| Wolfi | rancher-api-ui | 1.2.3-r15 |
| Wolfi | renovate | 44.133.0-r5 |
| Wolfi | tileserver-gl | 5.6.0-r20 |
| Wolfi | ts-patch | 4.0.1-r48 |