CVE-2026-106446

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{"bugzilla": {"description": "handlebars: Handlebars: JavaScript Injection via AST Type Confusion in compile (Program.blockParams)", "id": "2547120", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547120"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-94", "details": ["Handlebars provides the power necessary to let users build semantic templates. From 4.0.0 until 4.7.10, Handlebars.compile() and Handlebars.precompile() accept pre-parsed AST objects while validating only selected PathExpression, NumberLiteral, and BooleanLiteral values. This issue bypasses the AST validation introduced in version 4.7.9 for CVE-2026-33937. An attacker who can supply an object instead of a template string can place JavaScript expressions in unchecked values such as Program.blockParams.length, a non-PathExpression parameter depth, a non-string StringLiteral.value, or a non-string PathExpression.original. The compiler emits those values into generated JavaScript, causing code execution in the server process when compile output renders or wherever precompile output is loaded. Applications that pass only template strings are not affected. This issue is fixed in version 4.7.10.", "A flaw was found in Handlebars. Incomplete validation of pre-parsed AST objects passed to compile() or precompile() allows unchecked AST fields to be emitted into generated JavaScript. An attacker who can supply an object instead of a template string can inject and execute arbitrary JavaScript in the application process."], "mitigation": {"lang": "en:us", "value": "Upgrade to Handlebars 4.7.10 or later. Ensure only strings are passed to Handlebars.compile() and Handlebars.precompile(); reject non-string inputs. If templates are precompiled at build time, prefer the runtime-only build (handlebars/runtime) so compile() is unavailable on the server."}, "name": "CVE-2026-106446", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Affected", "impact": "important", "package_name": "cryostat/cryostat-openshift-console-plugin-rhel9", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "impact": "important", "package_name": "multicluster-engine/console-mce-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:workload_availability_nhc:0", "fix_state": "Affected", "impact": "important", "package_name": "workload-availability/node-healthcheck-must-gather-rhel9", "product_name": "Node HealthCheck Operator"}, {"cpe": "cpe:/a:redhat:workload_availability_nhc:0", "fix_state": "Affected", "impact": "important", "package_name": "workload-availability/node-healthcheck-operator-bundle", "product_name": "Node 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"product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-dashboard-operator-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-dashboard-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-mod-arch-agent-ops-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-mod-arch-automl-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-mod-arch-autorag-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-mod-arch-eval-hub-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-mod-arch-gen-ai-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-mod-arch-maas-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-mod-arch-mlflow-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "impact": "important", "package_name": "rhoai/odh-mod-arch-model-registry-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "package_name": "rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Not affected", "package_name": "devspaces/code-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "impact": "important", "package_name": "devspaces/dashboard-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_update_service:5", "fix_state": "Not affected", "package_name": "openshift-update-service/openshift-update-service-rhel8", "product_name": "Red Hat OpenShift Update Service"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "impact": "important", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:2", "fix_state": "Not affected", "package_name": "rhtpa/rhtpa-trustification-service-rhel9", "product_name": "Red Hat Trusted Profile Analyzer"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "impact": "important", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}], "public_date": "2026-10-06T19:41:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-106446\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-106446\nhttps://github.com/handlebars-lang/handlebars.js/commit/703fdcc5fd6cc8d1cc0c33cc19de40c467c4b8d2\nhttps://github.com/handlebars-lang/handlebars.js/pull/2185\nhttps://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.10\nhttps://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-8r5x-fm3f-whwj"], "statement": "This flaw has an Important impact. Exploitation requires an application to pass a non-string object (for example, a JSON-deserialized value) to Handlebars.compile() or Handlebars.precompile(). Applications that only pass template strings are not affected. When that unsafe calling pattern is present, injected JavaScript can run with the privileges of the Node.js process. The issue is not Critical for Red Hat scoring because successful exploitation depends on that non-default API usage condition (AC:H), not on typical string-template pipelines alone.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.7.10)"}}], "enrichment": {"confidence": 81.0, "confidence_source": "matching", "scores": [{"score": 81.0, "source": "matching"}]}, "original": {"product": "handlebars.js", "source": "cna", "vendor": "handlebars-lang"}, "product": "handlebars", "vendor": "handlebarsjs"}], "created": "2026-10-07T01:45:08.760408+00:00", "updated": "2026-10-09T07:45:18.057480+00:00", "vendors": ["handlebarsjs", "handlebarsjs$PRODUCT$handlebars"]}