CVE-2026-23953

{"id": "CVE-2026-23953", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23953", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-01-26T21:00:32.625486Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.7, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.8, "exploitabilityScore": 2.3}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "lxc", "product": "incus", "versions": [{"status": "affected", "version": ">= 6.1.0, <= 6.20.0"}, {"status": "affected", "version": "<= 6.0.5"}]}]}], "published": "2026-01-22T22:16:20.673", "references": [{"url": "https://github.com/lxc/incus/blob/HEAD/internal/server/instance/drivers/driver_lxc.go#L1081", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/lxc/incus/security/advisories/GHSA-x6jc-phwx-hp32", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/user-attachments/files/24473682/environment_newline_injection.sh", "tags": ["Exploit"], "source": "security-advisories@github.com"}, {"url": "https://github.com/user-attachments/files/24473685/environment_newline_injection.patch", "tags": ["Patch"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-93"}]}], "descriptions": [{"lang": "en", "value": "Incus is a system container and virtual machine manager. In versions 6.20.0 and below, a user with the ability to launch a container with a custom YAML configuration (e.g a member of the \u2018incus\u2019 group) can create an environment variable containing newlines, which can be used to add additional configuration items in the container\u2019s lxc.conf due to newline injection. This can allow adding arbitrary lifecycle hooks, ultimately resulting in arbitrary command execution on the host. Exploiting this issue on IncusOS requires a slight modification of the payload to change to a different writable directory for the validation step (e.g /tmp). This can be confirmed with a second container with /tmp mounted from the host (A privileged action for validation only). A fix is planned for versions 6.0.6\nand 6.21.0, but they have not been released at the time of publication."}, {"lang": "es", "value": "Incus es un gestor de contenedores de sistema y m\u00e1quinas virtuales. En las versiones 6.20.0 e inferiores, un usuario con la capacidad de lanzar un contenedor con una configuraci\u00f3n YAML personalizada (por ejemplo, un miembro del grupo 'incus') puede crear una variable de entorno que contiene saltos de l\u00ednea, la cual puede usarse para a\u00f1adir elementos de configuraci\u00f3n adicionales en el lxc.conf del contenedor debido a la inyecci\u00f3n de saltos de l\u00ednea. Esto puede permitir a\u00f1adir ganchos de ciclo de vida arbitrarios, lo que en \u00faltima instancia resulta en la ejecuci\u00f3n arbitraria de comandos en el anfitri\u00f3n. Explotar este problema en IncusOS requiere una ligera modificaci\u00f3n de la carga \u00fatil para cambiar a un directorio diferente con permisos de escritura para el paso de validaci\u00f3n (por ejemplo, /tmp). Esto puede confirmarse con un segundo contenedor con /tmp montado desde el anfitri\u00f3n (Una acci\u00f3n privilegiada solo para validaci\u00f3n). Se planea una soluci\u00f3n para las versiones 6.0.6 y 6.21.0, pero no han sido lanzadas en el momento de la publicaci\u00f3n."}], "lastModified": "2026-06-17T10:22:20.643", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0DF87DBE-86FF-4E74-8086-AE3360A94C71", "versionEndIncluding": "6.0.5"}, {"criteria": "cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "47AA575C-385C-4C34-8CC0-F370EC4ED7B4", "versionEndExcluding": "6.21.0", "versionStartIncluding": "6.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}