Vulnerability-Lookup

CVE-2026-27206 (GCVE-0-2026-27206)

Vulnerability from cvelistv5 – Published: 2026-02-21 07:01 – Updated: 2026-02-24 18:57

Title

Zumba Json Serializer has a potential PHP Object Injection via Unrestricted @type in unserialize()

Summary

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.

Severity ?

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

GitHub_M

References

URL

Tags

	https://github.com/zumba/json-serializer/security…	x_refsource_CONFIRM
	https://github.com/zumba/json-serializer/commit/b…	x_refsource_MISC
	https://github.com/zumba/json-serializer/releases…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	zumba	json-serializer	Affected: < 3.2.3

Show details on NVD website

JSON

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GHSA-V7M3-FPCR-H7M2

Vulnerability from github – Published: 2026-02-19 22:05 – Updated: 2026-02-23 22:28

Summary

Zumba Json Serializer has a potential PHP Object Injection via Unrestricted @type in unserialize()

Details

Description

The zumba/json-serializer library allows deserialization of PHP objects from JSON using a special @type field.

Prior to version 3.2.3, the deserializer would instantiate 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.

Impact

This vulnerability allows instantiation of arbitrary PHP classes via the @type field when deserializing JSON.

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.

Successful exploitation may lead to: * Arbitrary code execution * Data exfiltration * File manipulation * Denial of service

Applications that only deserialize trusted data are not affected.

Patches

This issue is mitigated in version 3.2.3.

Version 3.2.3 introduces the method: setAllowedClasses(?array $allowedClasses)

This allows applications to restrict which classes may be instantiated during deserialization, similar to PHP's native unserialize() allowed_classes option.

Users should upgrade to version 3.2.3 or later and configure an appropriate class allowlist.

Workarounds

If upgrading is not immediately possible, applications should ensure that: * JsonSerializer::unserialize() is never called on untrusted or attacker-controlled JSON. * JSON input is validated and sanitized before deserialization. * Object instantiation via @type is disabled in application logic where possible.

After upgrading, users can mitigate risk by explicitly configuring:

$serializer->setAllowedClasses([]);

to disable all object instantiation, or by providing a strict allowlist of safe classes.

References

CWE-502: https://cwe.mitre.org/data/definitions/502.html
PHP unserialize() documentation: https://www.php.net/manual/en/function.unserialize.php
OWASP PHP Object Injection: https://owasp.org/www-community/vulnerabilities/PHP_Object_Injection

Severity ?

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "zumba/json-serializer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27206"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-19T22:05:40Z",
    "nvd_published_at": "2026-02-21T07:16:11Z",
    "severity": "HIGH"
  },
  "details": "### Description\n\nThe `zumba/json-serializer` library allows deserialization of PHP objects from JSON using a special `@type` field.\n\nPrior to version 3.2.3, the deserializer would instantiate 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.\n\nIf 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.\n\nThis behavior is similar in risk profile to PHP\u0027s native `unserialize()` when used without the `allowed_classes` restriction.\n\n### Impact\n\nThis vulnerability allows instantiation of arbitrary PHP classes via the `@type` field when deserializing JSON.\n\nApplications are impacted only if:\n* Untrusted or attacker-controlled JSON is passed into `JsonSerializer::unserialize()`, and\n* The application or its dependencies contain classes that can be leveraged as a gadget chain.\n\nSuccessful exploitation may lead to:\n* Arbitrary code execution\n* Data exfiltration\n* File manipulation\n* Denial of service\n\nApplications that only deserialize trusted data are not affected.\n\n### Patches\n\nThis issue is mitigated in version 3.2.3.\n\nVersion 3.2.3 introduces the method: `setAllowedClasses(?array $allowedClasses)`\n\nThis allows applications to restrict which classes may be instantiated during deserialization, similar to PHP\u0027s native `unserialize()` `allowed_classes` option.\n\nUsers should upgrade to version 3.2.3 or later and configure an appropriate class allowlist.\n\n### Workarounds\n\nIf upgrading is not immediately possible, applications should ensure that:\n* `JsonSerializer::unserialize()` is never called on untrusted or attacker-controlled JSON.\n* JSON input is validated and sanitized before deserialization.\n* Object instantiation via `@type` is disabled in application logic where possible.\n\nAfter upgrading, users can mitigate risk by explicitly configuring:\n\n```php\n$serializer-\u003esetAllowedClasses([]);\n```\n\nto disable all object instantiation, or by providing a strict allowlist of safe classes.\n\n### References\n\n* CWE-502: https://cwe.mitre.org/data/definitions/502.html\n* PHP `unserialize()` documentation: https://www.php.net/manual/en/function.unserialize.php\n* OWASP PHP Object Injection: https://owasp.org/www-community/vulnerabilities/PHP_Object_Injection",
  "id": "GHSA-v7m3-fpcr-h7m2",
  "modified": "2026-02-23T22:28:11Z",
  "published": "2026-02-19T22:05:40Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zumba/json-serializer/security/advisories/GHSA-v7m3-fpcr-h7m2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27206"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zumba/json-serializer/commit/bf26227879adefce75eb9651040d8982be97b881"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/zumba/json-serializer"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zumba/json-serializer/releases/tag/3.2.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Zumba Json Serializer has a potential PHP Object Injection via Unrestricted @type in unserialize()"
}

FKIE_CVE-2026-27206

Vulnerability from fkie_nvd - Published: 2026-02-21 07:16 - Updated: 2026-02-23 18:13

Severity ?

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/zumba/json-serializer/commit/bf26227879adefce75eb9651040d8982be97b881
	security-advisories@github.com	https://github.com/zumba/json-serializer/releases/tag/3.2.3
	security-advisories@github.com	https://github.com/zumba/json-serializer/security/advisories/GHSA-v7m3-fpcr-h7m2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "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\u0027s 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\u0027t 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": "2026-02-23T18:13:53.397",
  "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"
      }
    ]
  },
  "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": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-27206 (GCVE-0-2026-27206)

GHSA-V7M3-FPCR-H7M2

Description

Impact

Patches

Workarounds

References

FKIE_CVE-2026-27206

Tags

Sightings

Nomenclature