CVE-2026-63343

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63343", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-16T14:14:24.385Z", "datePublished": "2026-08-21T14:53:26.109Z", "dateUpdated": "2026-08-21T21:44:03.623Z"}, "containers": {"cna": {"title": "Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root", "problemTypes": [{"descriptions": [{"cweId": "CWE-73", "lang": "en", "description": "CWE-73: External Control of File Name or Path", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p"}], "affected": [{"vendor": "lxc", "product": "incus", "versions": [{"version": "< 7.3.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-21T14:53:26.109Z"}, "descriptions": [{"lang": "en", "value": "Incus is a system container and virtual machine manager. Prior to version 7.3.0, a malicious image containing a `metadata.yaml` symlink pointing to an arbitrary host path allows an authenticated Incus user to read or overwrite any file on the host as root via the instance metadata API. The `exec-output` and `templates/` paths were patched in a prior release using `Lstat` rejection and `os.OpenRoot` confinement; `metadata.yaml` was not included in either patch and remains exploitable. Version 7.3.0 patches the issue."}], "source": {"advisory": "GHSA-fmjx-5j3g-997p", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-21T21:00:14.696240Z", "id": "CVE-2026-63343", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-21T21:44:03.623Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63343", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-08-21T21:00:14.696240Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-21T21:00:16.050Z"}}], "cna": {"title": "Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root", "source": {"advisory": "GHSA-fmjx-5j3g-997p", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.9, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "lxc", "product": "incus", "versions": [{"status": "affected", "version": "< 7.3.0"}]}], "references": [{"url": "https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p", "name": "https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p", "tags": ["x_refsource_CONFIRM"]}], "descriptions": [{"lang": "en", "value": "Incus is a system container and virtual machine manager. Prior to version 7.3.0, a malicious image containing a `metadata.yaml` symlink pointing to an arbitrary host path allows an authenticated Incus user to read or overwrite any file on the host as root via the instance metadata API. The `exec-output` and `templates/` paths were patched in a prior release using `Lstat` rejection and `os.OpenRoot` confinement; `metadata.yaml` was not included in either patch and remains exploitable. Version 7.3.0 patches the issue."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-73", "description": "CWE-73: External Control of File Name or Path"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-21T14:53:26.109Z"}}}, "cveMetadata": {"cveId": "CVE-2026-63343", "state": "PUBLISHED", "dateUpdated": "2026-08-21T21:44:03.623Z", "dateReserved": "2026-07-16T14:14:24.385Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-08-21T14:53:26.109Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "incus", "vendor": "lxc", "versions": [{"status": "affected", "version": "< 7.3.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Incus is a system container and virtual machine manager. Prior to version 7.3.0, a malicious image containing a `metadata.yaml` symlink pointing to an arbitrary host path allows an authenticated Incus user to read or overwrite any file on the host as root via the instance metadata API. The `exec-output` and `templates/` paths were patched in a prior release using `Lstat` rejection and `os.OpenRoot` confinement; `metadata.yaml` was not included in either patch and remains exploitable. Version 7.3.0 patches the issue."}, {"lang": "es", "value": "Incus es un gestor de contenedores de sistema y m\u00e1quinas virtuales. Antes de la versi\u00f3n 7.3.0, una imagen maliciosa que contiene un enlace simb\u00f3lico 'metadata.yaml' que apunta a una ruta de host arbitraria permite a un usuario autenticado de Incus leer o sobrescribir cualquier archivo en el host como root a trav\u00e9s de la API de metadatos de la instancia. Las rutas 'exec-output' y 'templates/' fueron parcheadas en una versi\u00f3n anterior utilizando el rechazo de 'Lstat' y el confinamiento de 'os.OpenRoot'; 'metadata.yaml' no se incluy\u00f3 en ninguno de los parches y sigue siendo explotable. La versi\u00f3n 7.3.0 parchea el problema."}], "id": "CVE-2026-63343", "lastModified": "2026-10-15T19:10:00.173", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63343", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-21T21:00:14.696240Z", "version": "2.0.3"}}]}, "published": "2026-08-21T15:16:46.577", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/lxc/incus/security/advisories/GHSA-fmjx-5j3g-997p"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-73"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.3.0)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "incus", "source": "cna", "vendor": "lxc"}, "product": "incus", "vendor": "lxc"}], "created": "2026-08-21T16:30:06.806936+00:00", "updated": "2026-08-21T17:00:04.112680+00:00", "vendors": ["lxc", "lxc$PRODUCT$incus"]}