CVE-2026-27206

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{"affected": [{"affectedData": [{"product": "json-serializer", "vendor": "zumba", "versions": [{"status": "affected", "version": "< 3.2.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Zumba Json Serializer is a library to serialize PHP variables in JSON format. In versions 3.2.2 and below, the library allows deserialization of PHP objects from JSON using a special @type field. The deserializer instantiates any class specified in the @type field without restriction. When processing untrusted JSON input, this behavior may allow an attacker to instantiate arbitrary classes available in the application. If a vulnerable application passes attacker-controlled JSON into JsonSerializer::unserialize() and contains classes with dangerous magic methods (such as __wakeup() or __destruct()), this may lead to PHP Object Injection and potentially Remote Code Execution (RCE), depending on available gadget chains in the application or its dependencies. This behavior is similar in risk profile to PHP's native unserialize() when used without the allowed_classes restriction. Applications are impacted only if untrusted or attacker-controlled JSON is passed into JsonSerializer::unserialize() and the application or its dependencies contain classes that can be leveraged as a gadget chain. This issue has been fixed in version 3.2.3. If an immediate upgrade isn't feasible, mitigate the vulnerability by never deserializing untrusted JSON with JsonSerializer::unserialize(), validating and sanitizing all JSON input before deserialization, and disabling @type-based object instantiation wherever possible."}, {"lang": "es", "value": "Zumba Json Serializer es una biblioteca para serializar variables de PHP en formato JSON. En las versiones 3.2.2 e inferiores, la biblioteca permite la deserializaci\u00f3n de objetos PHP desde JSON utilizando un campo especial @type. El deserializador instancia cualquier clase especificada en el campo @type sin restricciones. Al procesar entrada JSON no confiable, este comportamiento puede permitir a un atacante instanciar clases arbitrarias disponibles en la aplicaci\u00f3n. Si una aplicaci\u00f3n vulnerable pasa JSON controlado por el atacante a JsonSerializer::unserialize() y contiene clases con m\u00e9todos m\u00e1gicos peligrosos (como __wakeup() o __destruct()), esto puede llevar a la inyecci\u00f3n de objetos PHP y, potencialmente, a la ejecuci\u00f3n remota de c\u00f3digo (RCE), dependiendo de las cadenas de gadgets disponibles en la aplicaci\u00f3n o sus dependencias. Este comportamiento es similar en perfil de riesgo al unserialize() nativo de PHP cuando se usa sin la restricci\u00f3n allowed_classes. Las aplicaciones se ven afectadas solo si se pasa JSON no confiable o controlado por el atacante a JsonSerializer::unserialize() y la aplicaci\u00f3n o sus dependencias contienen clases que pueden ser aprovechadas como una cadena de gadgets. Este problema ha sido solucionado en la versi\u00f3n 3.2.3. Si una actualizaci\u00f3n inmediata no es factible, mitigue la vulnerabilidad al nunca deserializar JSON no confiable con JsonSerializer::unserialize(), validando y saneando toda la entrada JSON antes de la deserializaci\u00f3n, y deshabilitando la instanciaci\u00f3n de objetos basada en @type siempre que sea posible."}], "id": "CVE-2026-27206", "lastModified": "2026-06-17T10:26:50.817", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27206", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-24T18:56:54.179563Z", "version": "2.0.3"}}]}, "published": "2026-02-21T07:16:11.753", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/zumba/json-serializer/commit/bf26227879adefce75eb9651040d8982be97b881"}, {"source": "security-advisories@github.com", "url": "https://github.com/zumba/json-serializer/releases/tag/3.2.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/zumba/json-serializer/security/advisories/GHSA-v7m3-fpcr-h7m2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.2.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "json-serializer", "source": "cna", "vendor": "zumba"}, "product": "json-serializer", "vendor": "zumba"}], "analysis": {"en": {"generated_at": "2026-04-17T16:50:44.132318+00:00", "value": {"mitigation_remediation": ["Upgrade to version\u00a03.2.3 or later of Zumba Json Serializer to apply the vendor\u2019s fix.", "Disable @type\u2011based object instantiation in JsonSerializer when it is available, so that only primitive types can be deserialized.", "Validate or sanitize all JSON input before calling JsonSerializer::unserialize(), or avoid calling unserialize on any untrusted data completely."], "summary": {"action": "Immediate Patch", "impact": "Potential RCE via PHP Object Injection"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the Zumba Json Serializer project, specifically all releases up to and including 3.2.2. Users of 3.2.2 or earlier who call JsonSerializer::unserialize() with untrusted or attacker\u2011controlled JSON are at risk. The fix was released in version\u00a03.2.3, and later releases are not impacted.", "description_and_impact": "The Zumba Json Serializer library provides JSON serialization and deserialization of PHP data. In versions 3.2.2 and earlier, the deserializer accepts an @type field that specifies a PHP class to instantiate. Because this field is processed without any restriction, an attacker can cause the library to create any class that exists in the running application. The resulting object may invoke magic methods such as __wakeup() or __destruct(), which can lead to PHP object injection. If the application or any of its dependencies provide a gadget chain that can be triggered by these methods, remote code execution becomes possible. This weakness corresponds to CWE\u2011502, the improper handling of serialized data.", "risk_and_exploitability": "The CVSS v3 score of\u00a08.1 indicates high severity, though the EPSS probability is below\u00a01\u202f%, suggesting exploitation is unlikely at present. Nevertheless, any application that accepts arbitrary JSON from external sources and forwards it to JsonSerializer::unserialize() is vulnerable, as the attacker must provide the JSON payload and the target environment must contain exploitable classes. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog, but it shares the risk profile of native PHP unserialize without allowed_classes safeguards."}}}}, "created": "2026-02-23T14:32:26.198951+00:00", "updated": "2026-04-17T17:00:10.172036+00:00", "vendors": ["zumba", "zumba$PRODUCT$json-serializer"]}