CVE-2026-55406

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55406", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-16T21:48:43.124Z", "datePublished": "2026-07-16T15:54:29.511Z", "dateUpdated": "2026-07-16T16:47:37.717Z"}, "containers": {"cna": {"title": "Buffa: Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref", "problemTypes": [{"descriptions": [{"cweId": "CWE-200", "lang": "en", "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-416", "lang": "en", "description": "CWE-416: Use After Free", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh"}, {"name": "https://github.com/anthropics/buffa/pull/154", "tags": ["x_refsource_MISC"], "url": "https://github.com/anthropics/buffa/pull/154"}, {"name": "https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e", "tags": ["x_refsource_MISC"], "url": "https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e"}, {"name": "https://github.com/anthropics/buffa/releases/tag/v0.7.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/anthropics/buffa/releases/tag/v0.7.0"}], "affected": [{"vendor": "anthropics", "product": "buffa", "versions": [{"version": "< 0.7.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-16T15:54:29.511Z"}, "descriptions": [{"lang": "en", "value": "Buffa is a pure-Rust Protocol Buffers implementation with first-class protobuf editions support. Prior to 0.7.0, a soundness bug in the OwnedView<V> type allowed safe Rust code to trigger a use-after-free: the OwnedView::decode constructor transmuted a borrowed slice to &'static [u8], and the Deref implementation exposed the promoted 'static lifetime on borrowed view fields (such as &'static str and &'static [u8]) to callers, so the borrow checker permitted those references to outlive the OwnedView; once the OwnedView was dropped and its backing buffer freed, the references became dangling, enabling memory corruption, information disclosure of freed heap contents, and cross-thread misuse without any unsafe code in the calling application. This issue is fixed in version 0.7.0."}], "source": {"advisory": "GHSA-9pwq-gcrx-wghh", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-16T16:47:16.390744Z", "id": "CVE-2026-55406", "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": "2026-07-16T16:47:37.717Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55406", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-16T16:47:16.390744Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-16T16:47:31.435Z"}}], "cna": {"title": "Buffa: Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref", "source": {"advisory": "GHSA-9pwq-gcrx-wghh", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 5.9, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH"}}], "affected": [{"vendor": "anthropics", "product": "buffa", "versions": [{"status": "affected", "version": "< 0.7.0"}]}], "references": [{"url": "https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh", "name": "https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/anthropics/buffa/pull/154", "name": "https://github.com/anthropics/buffa/pull/154", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e", "name": "https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/anthropics/buffa/releases/tag/v0.7.0", "name": "https://github.com/anthropics/buffa/releases/tag/v0.7.0", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Buffa is a pure-Rust Protocol Buffers implementation with first-class protobuf editions support. Prior to 0.7.0, a soundness bug in the OwnedView<V> type allowed safe Rust code to trigger a use-after-free: the OwnedView::decode constructor transmuted a borrowed slice to &'static [u8], and the Deref implementation exposed the promoted 'static lifetime on borrowed view fields (such as &'static str and &'static [u8]) to callers, so the borrow checker permitted those references to outlive the OwnedView; once the OwnedView was dropped and its backing buffer freed, the references became dangling, enabling memory corruption, information disclosure of freed heap contents, and cross-thread misuse without any unsafe code in the calling application. This issue is fixed in version 0.7.0."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-200", "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416: Use After Free"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-16T15:54:29.511Z"}}}, "cveMetadata": {"cveId": "CVE-2026-55406", "state": "PUBLISHED", "dateUpdated": "2026-07-16T16:47:37.717Z", "dateReserved": "2026-06-16T21:48:43.124Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-07-16T15:54:29.511Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "buffa", "vendor": "anthropics", "versions": [{"status": "affected", "version": "< 0.7.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Buffa is a pure-Rust Protocol Buffers implementation with first-class protobuf editions support. Prior to 0.7.0, a soundness bug in the OwnedView<V> type allowed safe Rust code to trigger a use-after-free: the OwnedView::decode constructor transmuted a borrowed slice to &'static [u8], and the Deref implementation exposed the promoted 'static lifetime on borrowed view fields (such as &'static str and &'static [u8]) to callers, so the borrow checker permitted those references to outlive the OwnedView; once the OwnedView was dropped and its backing buffer freed, the references became dangling, enabling memory corruption, information disclosure of freed heap contents, and cross-thread misuse without any unsafe code in the calling application. This issue is fixed in version 0.7.0."}, {"lang": "es", "value": "Buffa es una implementaci\u00f3n puramente en Rust de Protocol Buffers con soporte de primera clase para ediciones de protobuf. Antes de la versi\u00f3n 0.7.0, un error de solidez en el tipo OwnedView[V] permit\u00eda que c\u00f3digo Rust seguro desencadenara un uso despu\u00e9s de liberaci\u00f3n: el constructor OwnedView::decode transmutaba un \u2019slice\u2019 prestado a &\u2019static [u8], y la implementaci\u00f3n de Deref expon\u00eda la vida \u00fatil \u2019static promovida en campos de vista prestados (como &\u2019static str y &\u2019static [u8]) a los llamadores, por lo que el verificador de pr\u00e9stamos permit\u00eda que esas referencias sobrevivieran al OwnedView; una vez que el OwnedView era descartado y su b\u00fafer de respaldo liberado, las referencias quedaban colgantes, lo que permit\u00eda la corrupci\u00f3n de memoria, la revelaci\u00f3n de informaci\u00f3n del contenido de la memoria \u2019heap\u2019 liberada y el uso indebido entre hilos sin ning\u00fan c\u00f3digo inseguro en la aplicaci\u00f3n llamadora. Este problema est\u00e1 solucionado en la versi\u00f3n 0.7.0."}], "id": "CVE-2026-55406", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.9, "baseSeverity": "MEDIUM", "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": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/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": "HIGH", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55406", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-16T16:47:16.390744Z", "version": "2.0.3"}}]}, "published": "2026-07-16T17:16:57.623", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e"}, {"source": "security-advisories@github.com", "url": "https://github.com/anthropics/buffa/pull/154"}, {"source": "security-advisories@github.com", "url": "https://github.com/anthropics/buffa/releases/tag/v0.7.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}, {"lang": "en", "value": "CWE-416"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.7.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "buffa", "source": "cna", "vendor": "anthropics"}, "product": "buffa", "vendor": "anthropics"}], "created": "2026-07-17T04:00:06.740039+00:00", "updated": "2026-08-01T08:45:02.871680+00:00", "vendors": ["anthropics", "anthropics$PRODUCT$buffa"]}