CVE-2026-33938

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"rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9", "product": "Red Hat OpenShift AI (RHOAI)", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:openshift_devspaces:3"], "defaultStatus": "unaffected", "packageName": "devspaces/dashboard-rhel9", "product": "Red Hat OpenShift Dev Spaces", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:jboss_enterprise_bpms_platform:7"], "defaultStatus": "unaffected", "packageName": "handlebars", "product": "Red Hat Process Automation 7", "vendor": "Red Hat"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:handlebarsjs:handlebars:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "A9D1F9A7-8359-4C3F-9932-4A085094F388", "versionEndExcluding": "4.7.9", "versionStartIncluding": "4.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the `@partial-block` special variable is stored in the template data context and is reachable and mutable from within a template via helpers that accept arbitrary objects. When a helper overwrites `@partial-block` with a crafted Handlebars AST, a subsequent invocation of `{{> @partial-block}}` compiles and executes that AST, enabling arbitrary JavaScript execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. First, use the runtime-only build (`require('handlebars/runtime')`). The `compile()` method is absent, eliminating the vulnerable fallback path. Second, audit registered helpers for any that write arbitrary values to context objects. Helpers should treat context data as read-only. Third, avoid registering helpers from third-party packages (such as `handlebars-helpers`) in contexts where templates or context data can be influenced by untrusted input."}, {"lang": "es", "value": "Handlebars proporciona la potencia necesaria para permitir a los usuarios construir plantillas sem\u00e1nticas. En las versiones 4.0.0 a 4.7.8, la variable especial \u201c@partial-block\u201d se almacena en el contexto de datos de la plantilla y es accesible y mutable desde dentro de una plantilla a trav\u00e9s de helpers que aceptan objetos arbitrarios. Cuando un helper sobrescribe \u201c@partial-block\u201d con un AST de Handlebars manipulado, una invocaci\u00f3n posterior de \u201c{{> @partial-block}}\u201d compila y ejecuta ese AST, permitiendo la ejecuci\u00f3n arbitraria de JavaScript en el servidor. La versi\u00f3n 4.7.9 corrige el problema. Hay algunas soluciones alternativas disponibles. Primero, use la compilaci\u00f3n solo en tiempo de ejecuci\u00f3n (\u201crequire(\u2019handlebars/runtime\u2019)\u201d). El m\u00e9todo \u201ccompile()\u201d est\u00e1 ausente, eliminando la ruta de reserva vulnerable. Segundo, audite los helpers registrados en busca de cualquiera que escriba valores arbitrarios en objetos de contexto. Los helpers deben tratar los datos de contexto como de solo lectura. Tercero, evite registrar helpers de paquetes de terceros (como \u201chandlebars-helpers\u201d) en contextos donde las plantillas o los datos de contexto puedan ser influenciados por entradas no confiables."}], "id": "CVE-2026-33938", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33938", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-03-31T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-03-27T21:17:27.587", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-3mfm-83xf-c92r"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:10175"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:34342"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-33938"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452525"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-3mfm-83xf-c92r"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33938.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}, {"lang": "en", "value": "CWE-843"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-917"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "handlebars: Handlebars: Arbitrary code execution via @partial-block overwrite", "id": "2452525", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452525"}, "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-917", "details": ["A flaw was found in Handlebars. A remote attacker can exploit this vulnerability by manipulating the `@partial-block` special variable within the template data context. By overwriting `@partial-block` with a specially crafted Abstract Syntax Tree (AST) through a helper, a subsequent invocation of `{{> @partial-block}}` will compile and execute the malicious AST. This enables arbitrary JavaScript execution on the server, leading to potential compromise of the system."], "mitigation": {"lang": "en:us", "value": "Applications using Handlebars should implement the runtime-only build (`require('handlebars/runtime')`) to prevent exploitation, as this build lacks the vulnerable `compile()` method. Additionally, review all registered helpers to ensure they do not write arbitrary values to context objects, and avoid using third-party helpers in contexts exposed to untrusted input."}, "name": "CVE-2026-33938", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Affected", "package_name": "handlebars", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Affected", "package_name": "openshift-logging/elasticsearch6-rhel9", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Affected", "package_name": "openshift-logging/elasticsearch-operator-bundle", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Affected", "package_name": "openshift-logging/elasticsearch-proxy-rhel9", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Affected", "package_name": "openshift-logging/elasticsearch-rhel9-operator", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Affected", "package_name": "openshift-logging/kibana6-rhel8", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Affected", "package_name": "openshift-logging/logging-curator5-rhel9", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:jboss_data_grid:8", "fix_state": "Affected", "package_name": "handlebars", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "389-ds:1.4/389-ds-base", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "mozjs60", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "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": "Affected", "package_name": "devspaces/code-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_bpms_platform:7", "fix_state": "Affected", "package_name": "handlebars", "product_name": "Red Hat Process Automation 7"}], "public_date": "2026-03-27T21:05:42Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33938\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33938\nhttps://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2\nhttps://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9\nhttps://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-3mfm-83xf-c92r"], "statement": "Important: A flaw in Handlebars allows arbitrary code execution when processing untrusted input. This occurs if an attacker can manipulate the `@partial-block` special variable through a helper, leading to the execution of a crafted Abstract Syntax Tree. Red Hat products are affected if they use Handlebars versions 4.0.0 through 4.7.8 in server-side applications where untrusted input can influence template data or context objects. Deployments utilizing the Handlebars runtime-only build are not vulnerable.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.7.9)"}}], "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"}], "analysis": {"en": {"generated_at": "2026-03-31T19:42:21.565281+00:00", "value": {"mitigation_remediation": ["Upgrade Handlebars.js to version\u00a04.7.9 or later.", "If immediate upgrade is not possible, use the runtime\u2011only build by requiring 'handlebars/runtime', which removes the compile path used by the vulnerability.", "Audit all registered helpers to ensure none write arbitrary values to context objects; remove or refactor those that do.", "Treat context data as read\u2011only within all helpers.", "Avoid registering third\u2011party helpers, such as from 'handlebars-helpers', when template or context data may come from untrusted sources.", "Monitor the Handlebars project for any additional advisories or patches."], "summary": {"action": "Immediate Patch", "impact": "Arbitrary JavaScript Execution on Server"}, "threat_synthesis": {"affected_systems": "All Node.js applications using Handlebars.js between versions 4.0.0 and 4.7.8, inclusive, are affected. The issue is resolved in 4.7.9 and later. Applications that embed third\u2011party helpers or allow untrusted data to influence template helpers are at greater risk.", "description_and_impact": "A vulnerable version of the templating library allows engineered changes to a special context variable to inject a Handlebars Abstract Syntax Tree that is then compiled. This results in execution of arbitrary JavaScript code on the server, compromising confidentiality, integrity, and availability of the affected application. The weakness is categorized under CWE\u2011843, CWE\u2011917, and CWE\u201194.", "risk_and_exploitability": "The reported CVSS score is 8.1, indicating high severity. EPSS indicates less than 1% chance of exploitation in the wild, and the vulnerability is not listed in the CISA KEV catalog. The likely attack vector requires the attacker to control template helper input or to supply malicious data to a helper that writes to the context; thus, environments that expose helper internals to untrusted data are the most susceptible."}}}}, "created": "2026-03-29T20:29:50.649351+00:00", "updated": "2026-03-31T20:00:40.783831+00:00", "vendors": ["handlebarsjs", "handlebarsjs$PRODUCT$handlebars"]}