CVE-2026-47746

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-47746", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-19T22:16:39.504Z", "datePublished": "2026-08-03T21:56:40.198Z", "dateUpdated": "2026-08-04T14:11:19.206Z"}, "containers": {"cna": {"title": "Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks", "problemTypes": [{"descriptions": [{"cweId": "CWE-367", "lang": "en", "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "baseScore": 8.9, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387"}, {"name": "https://github.com/misskey-dev/misskey/releases/tag/2026.5.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/misskey-dev/misskey/releases/tag/2026.5.4"}], "affected": [{"vendor": "misskey-dev", "product": "misskey", "versions": [{"version": ">= 12.37.0, < 2026.5.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-03T21:56:40.198Z"}, "descriptions": [{"lang": "en", "value": "Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared between signature verification and subsequent processing, the application may trust information that should not be trusted, resulting in a time-of-check to time-of-use (TOCTOU) flaw. This allows an attacker to have fraudulent activities accepted as valid, leading to a loss of integrity. This issue has been fixed in version 2026.5.4."}], "source": {"advisory": "GHSA-38jx-423m-g387", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-04T14:11:08.087443Z", "id": "CVE-2026-47746", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-04T14:11:19.206Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks", "source": {"advisory": "GHSA-38jx-423m-g387", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 8.9, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE"}}], "affected": [{"vendor": "misskey-dev", "product": "misskey", "versions": [{"status": "affected", "version": ">= 12.37.0, < 2026.5.4"}]}], "references": [{"url": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387", "name": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/misskey-dev/misskey/releases/tag/2026.5.4", "name": "https://github.com/misskey-dev/misskey/releases/tag/2026.5.4", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared between signature verification and subsequent processing, the application may trust information that should not be trusted, resulting in a time-of-check to time-of-use (TOCTOU) flaw. This allows an attacker to have fraudulent activities accepted as valid, leading to a loss of integrity. This issue has been fixed in version 2026.5.4."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-367", "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-03T21:56:40.198Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-47746", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-04T14:11:08.087443Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-08-04T14:11:13.575Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-47746", "state": "PUBLISHED", "dateUpdated": "2026-08-03T21:56:40.198Z", "dateReserved": "2026-05-19T22:16:39.504Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-08-03T21:56:40.198Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "misskey", "vendor": "misskey-dev", "versions": [{"status": "affected", "version": ">= 12.37.0, < 2026.5.4"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, are vulnerable to timing attacks during JSON-LD signature validation and the compaction process. Because the JSON-LD parsing context is not shared between signature verification and subsequent processing, the application may trust information that should not be trusted, resulting in a time-of-check to time-of-use (TOCTOU) flaw. This allows an attacker to have fraudulent activities accepted as valid, leading to a loss of integrity. This issue has been fixed in version 2026.5.4."}, {"lang": "es", "value": "Misskey es una plataforma de redes sociales de c\u00f3digo abierto y federada. Las versiones 12.37.0 y posteriores, pero anteriores a la 2026.5.4, son vulnerables a ataques de temporizaci\u00f3n durante la validaci\u00f3n de firmas JSON-LD y el proceso de compactaci\u00f3n. Debido a que el contexto de an\u00e1lisis JSON-LD no se comparte entre la verificaci\u00f3n de la firma y el procesamiento posterior, la aplicaci\u00f3n puede confiar en informaci\u00f3n que no deber\u00eda ser de confianza, lo que resulta en una falla de tiempo de verificaci\u00f3n a tiempo de uso (TOCTOU). Esto permite a un atacante que actividades fraudulentas sean aceptadas como v\u00e1lidas, lo que lleva a una p\u00e9rdida de integridad. Este problema ha sido solucionado en la versi\u00f3n 2026.5.4."}], "id": "CVE-2026-47746", "lastModified": "2026-10-23T21:10:00.157", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.9, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47746", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-04T14:11:08.087443Z", "version": "2.0.3"}}]}, "published": "2026-08-03T22:16:49.447", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/misskey-dev/misskey/releases/tag/2026.5.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/misskey-dev/misskey/security/advisories/GHSA-38jx-423m-g387"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[12.37.0,2026.5.4)"}}], "enrichment": {"confidence": 88.0, "confidence_source": "matching", "scores": [{"score": 88.0, "source": "matching"}]}, "original": {"product": "misskey", "source": "cna", "vendor": "misskey-dev"}, "product": "misskey", "vendor": "misskey"}], "created": "2026-08-04T09:45:03.685856+00:00", "updated": "2026-08-05T09:45:06.868767+00:00", "vendors": ["misskey", "misskey$PRODUCT$misskey"]}