{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59876", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-07T15:41:53.607Z", "datePublished": "2026-07-08T15:31:11.421Z", "dateUpdated": "2026-07-08T15:31:11.421Z"}, "containers": {"cna": {"title": "protobufjs: Text Format string map parsing can mutate returned map object prototype", "problemTypes": [{"descriptions": [{"cweId": "CWE-1321", "lang": "en", "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-jfj6-75fj-8934", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-jfj6-75fj-8934"}, {"name": "https://github.com/protobufjs/protobuf.js/pull/2335", "tags": ["x_refsource_MISC"], "url": "https://github.com/protobufjs/protobuf.js/pull/2335"}, {"name": "https://github.com/protobufjs/protobuf.js/commit/9f97fe413072d3beb52c74e62d88ea8adc9444d8", "tags": ["x_refsource_MISC"], "url": "https://github.com/protobufjs/protobuf.js/commit/9f97fe413072d3beb52c74e62d88ea8adc9444d8"}, {"name": "https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.5", "tags": ["x_refsource_MISC"], "url": "https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.5"}], "affected": [{"vendor": "protobufjs", "product": "protobuf.js", "versions": [{"version": ">= 8.2.0, < 8.6.5", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T15:31:11.421Z"}, "descriptions": [{"lang": "en", "value": "protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key __proto__ to change the prototype of the returned map object instead of creating an own map entry in protobufjs/ext/textformat. This issue is fixed in version 8.6.5."}], "source": {"advisory": "GHSA-jfj6-75fj-8934", "discovery": "UNKNOWN"}}}}

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