{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33743", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-23T17:34:57.561Z", "datePublished": "2026-03-26T22:40:07.499Z", "dateUpdated": "2026-03-27T13:53:39.299Z"}, "containers": {"cna": {"title": "Incus vulnerable to denial of source through crafted bucket backup file", "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3"}], "affected": [{"vendor": "lxc", "product": "incus", "versions": [{"version": "< 6.23.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-26T22:40:07.499Z"}, "descriptions": [{"lang": "en", "value": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, a specially crafted storage bucket backup can be used by an user with access to Incus' storage bucket feature to crash the Incus daemon. Repeated use of this attack can be used to keep the server offline causing a denial of service of the control plane API. This does not impact any running workload, existing containers and virtual machines will keep operating. Version 6.23.0 fixes the issue."}], "source": {"advisory": "GHSA-vg76-xmhg-j5x3", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-27T13:27:44.938386Z", "id": "CVE-2026-33743", "options": [{"Exploitation": "poc"}, {"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": "2026-03-27T13:53:39.299Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Incus is a system container and virtual machine manager. Prior to version 6.23.0, a specially crafted storage bucket backup can be used by an user with access to Incus' storage bucket feature to crash the Incus daemon. Repeated use of this attack can be used to keep the server offline causing a denial of service of the control plane API. This does not impact any running workload, existing containers and virtual machines will keep operating. Version 6.23.0 fixes the issue."}, {"lang": "es", "value": "Incus es un gestor de contenedores de sistema y m\u00e1quinas virtuales. Antes de la versi\u00f3n 6.23.0, una copia de seguridad de bucket de almacenamiento especialmente dise\u00f1ada puede ser utilizada por un usuario con acceso a la caracter\u00edstica de bucket de almacenamiento de Incus para hacer fallar el demonio de Incus. El uso repetido de este ataque puede ser utilizado para mantener el servidor fuera de l\u00ednea, causando una denegaci\u00f3n de servicio de la API del plano de control. Esto no tiene impacto en ninguna carga de trabajo en ejecuci\u00f3n; los contenedores y m\u00e1quinas virtuales existentes seguir\u00e1n funcionando. La versi\u00f3n 6.23.0 corrige el problema."}], "id": "CVE-2026-33743", "lastModified": "2026-03-27T15:16:56.990", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-26T23:16:20.583", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "incus: Incus: Denial of Service via specially crafted storage bucket backup", "id": "2452024", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452024"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1286", "details": ["A flaw was found in Incus, a system container and virtual machine manager. A user with access to Incus' storage bucket feature can exploit this vulnerability by using a specially crafted storage bucket backup. This can cause the Incus daemon to crash, leading to a denial of service of the control plane API. Repeated exploitation can keep the server offline, though existing containers and virtual machines will continue to operate."], "name": "CVE-2026-33743", "public_date": "2026-03-26T22:40:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33743\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33743\nhttps://github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3"], "statement": "This Moderate impact flaw in Incus allows a user with access to the storage bucket feature to trigger a denial of service of the control plane API by providing a specially crafted storage bucket backup. While the Incus daemon may crash, existing containers and virtual machines will continue to operate without interruption. This affects Incus as distributed in Fedora.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.23.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "incus", "source": "cna", "vendor": "lxc"}, "product": "incus", "vendor": "lxc"}], "analysis": {"en": {"generated_at": "2026-03-27T06:28:10.801487+00:00", "value": {"mitigation_remediation": ["Upgrade Incus to version 6.23.0 or later", "Restrict access to the storage bucket backup feature until a patch is applied"], "summary": {"action": "Patch Now", "impact": "Denial of Service to Incus control plane API"}, "threat_synthesis": {"affected_systems": "The issue affects the Incus container and virtual machine manager from vendor lxc, versions prior to 6.23.0. These systems expose a storage bucket backup capability that an authenticated user can exploit.", "description_and_impact": "A specially crafted storage bucket backup file can cause the Incus daemon to crash. Repeated use results in a denial of service to the Incus control plane API, while existing containers and virtual machines continue to operate normally. The vulnerability does not affect in\u2011use workloads but disrupts management and orchestration functions.", "risk_and_exploitability": "The CVSS score of 6.5 indicates moderate severity. Since the exploit requires only crafted backup operations, it is relatively easy for a user with storage bucket privileges to execute. Because the attack does not involve remote code execution or privilege escalation, it is confined to causing service disruption rather than compromising system security. The vulnerability is not listed in CISA's KEV catalog and EPSS is not available, but the impact on management availability makes it significant for environments relying on Incus for orchestration."}}}}, "created": "2026-03-27T08:31:29.343885+00:00", "updated": "2026-03-27T09:22:53.295279+00:00", "vendors": ["lxc", "lxc$PRODUCT$incus"]}