CVE-2026-33532

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Parsing a YAML document with a version of `yaml` on the 1.x branch prior to 1.10.3 or on the 2.x branch prior to 2.8.3 may throw a RangeError due to a stack overflow. The node resolution/composition phase uses recursive function calls without a depth bound. An attacker who can supply YAML for parsing can trigger a `RangeError: Maximum call stack size exceeded` with a small payload (~2\u201310 KB). The `RangeError` is not a `YAMLParseError`, so applications that only catch YAML-specific errors will encounter an unexpected exception type. Depending on the host application's exception handling, this can fail requests or terminate the Node.js process. Flow sequences allow deep nesting with minimal bytes (2 bytes per level: one `[` and one `]`). On the default Node.js stack, approximately 1,000\u20135,000 levels of nesting (2\u201310 KB input) exhaust the call stack. The exact threshold is environment-dependent (Node.js version, stack size, call stack depth at invocation). Note: the library's `Parser` (CST phase) uses a stack-based iterative approach and is not affected. Only the compose/resolve phase uses actual call-stack recursion. All three public parsing APIs are affected: `YAML.parse()`, `YAML.parseDocument()`, and `YAML.parseAllDocuments()`. Versions 1.10.3 and 2.8.3 contain a patch."}, {"lang": "es", "value": "`yaml` es un analizador y serializador YAML para JavaScript. Analizar un documento YAML con una versi\u00f3n de `yaml` en la rama 1.x anterior a la 1.10.3 o en la rama 2.x anterior a la 2.8.3 puede lanzar un RangeError debido a un desbordamiento de pila. La fase de resoluci\u00f3n/composici\u00f3n de nodos utiliza llamadas a funciones recursivas sin un l\u00edmite de profundidad. Un atacante que puede proporcionar YAML para el an\u00e1lisis puede desencadenar un 'RangeError: Maximum call stack size exceeded' con una peque\u00f1a carga \u00fatil (~2\u201310 KB). El `RangeError` no es un `YAMLParseError`, por lo que las aplicaciones que solo capturan errores espec\u00edficos de YAML encontrar\u00e1n un tipo de excepci\u00f3n inesperado. Dependiendo del manejo de excepciones de la aplicaci\u00f3n anfitriona, esto puede hacer que fallen las solicitudes o terminar el proceso de Node.js. Las secuencias de flujo permiten un anidamiento profundo con bytes m\u00ednimos (2 bytes por nivel: uno '[' y uno ']'). En la pila predeterminada de Node.js, aproximadamente 1,000\u20135,000 niveles de anidamiento (entrada de 2\u201310 KB) agotan la pila de llamadas. El umbral exacto depende del entorno (versi\u00f3n de Node.js, tama\u00f1o de la pila, profundidad de la pila de llamadas en la invocaci\u00f3n). Nota: el `Parser` de la biblioteca (fase CST) utiliza un enfoque iterativo basado en pila y no se ve afectado. Solo la fase de composici\u00f3n/resoluci\u00f3n utiliza recursi\u00f3n real de la pila de llamadas. Las tres API de an\u00e1lisis p\u00fablicas se ven afectadas: `YAML.parse()`, `YAML.parseDocument()` y `YAML.parseAllDocuments()`. Las versiones 1.10.3 y 2.8.3 contienen un parche."}], "id": "CVE-2026-33532", "lastModified": "2026-06-17T10:37:39.880", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33532", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-30T11:26:14.745560Z", "version": "2.0.3"}}]}, "published": "2026-03-26T20:16:15.543", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/eemeli/yaml/commit/1e84ebbea7ec35011a4c61bbb820a529ee4f359b"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/eemeli/yaml/releases/tag/v1.10.3"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/eemeli/yaml/releases/tag/v2.8.3"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/eemeli/yaml/security/advisories/GHSA-48c2-rrv3-qjmp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "yaml: yaml: Denial of Service via deeply nested YAML document parsing", "id": "2451858", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451858"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-606", "details": ["A flaw was found in `yaml`, a YAML parser and serializer for JavaScript. An attacker who can supply a specially crafted, deeply nested YAML document for parsing can trigger a `RangeError` due to a stack overflow. This can lead to a Denial of Service (DoS) by exhausting the call stack, potentially causing the application to fail requests or terminate the Node.js process."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-33532", "package_state": [{"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Fix deferred", "package_name": "multicluster-engine/console-mce-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-console-plugin-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-hub-ui-rhel8", 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"quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "nodejs-emotion", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vulnerability-frontend-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Fix deferred", "package_name": "yaml", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Fix deferred", "package_name": "yaml", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Fix deferred", "package_name": "yaml", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-03-26T19:49:03Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33532\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33532\nhttps://github.com/eemeli/yaml/commit/1e84ebbea7ec35011a4c61bbb820a529ee4f359b\nhttps://github.com/eemeli/yaml/releases/tag/v1.10.3\nhttps://github.com/eemeli/yaml/releases/tag/v2.8.3\nhttps://github.com/eemeli/yaml/security/advisories/GHSA-48c2-rrv3-qjmp"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0,2.8.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.0.0,1.10.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "yaml", "source": "cna", "vendor": "eemeli"}, "product": "yaml", "vendor": "eemeli"}], "analysis": {"en": {"generated_at": "2026-04-02T22:14:46.602150+00:00", "value": {"mitigation_remediation": ["Upgrade the yaml package to at least v1.10.3 or v2.8.3", "Restrict the maximum size of YAML documents processed (reject payloads larger than 10\u00a0KB)", "Ensure the application catches generic JavaScript errors, not only YAMLParseError, so that a RangeError does not crash the process"], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Affected is the eemeli:yaml library, the YAML parser and serializer for JavaScript. All public parsing methods \u2013 YAML.parse(), YAML.parseDocument(), and YAML.parseAllDocuments() \u2013 are impacted. Versions on the 1.x branch prior to 1.10.3 and on the 2.x branch prior to 2.8.3 have the flaw; patch releases 1.10.3 and 2.8.3 contain the fix. Any application that processes user\u2011supplied YAML using an older version is at risk.", "description_and_impact": "The vulnerability occurs within the yaml library used by Node.js applications. During YAML compose and resolve, a recursive function lacks depth limits, allowing an attacker who can supply YAML to trigger a stack overflow. This manifests as a RangeError: Maximum call stack size exceeded. Because the error is not a YAMLParseError, applications that only catch YAML\u2011specific errors may not handle it, leading to unhandled exceptions that can terminate the Node.js process or simply return a failed request. The result is a denial of service or, in worst cases, a crash that may expose runtime data.", "risk_and_exploitability": "The CVSS score of 4.3 reflects medium severity, and the EPSS value (<1%) indicates a low likelihood of exploitation. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. An attacker only needs to send a maliciously nested YAML document, which can be as small as 2\u201310\u00a0KB, and it will trigger the overflow during parsing. Since the stack depth threshold is about 1,000\u20135,000 nested levels, exploitation is straightforward once the payload is received. The impact is confined to the process parsing the YAML, meaning remote or local control of the upstream endpoint can cause service interruption."}}}}, "created": "2026-03-27T08:32:22.787651+00:00", "updated": "2026-04-03T09:38:51.144053+00:00", "vendors": ["eemeli", "eemeli$PRODUCT$yaml"]}