CVE-2026-49237

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["MacOS"], "product": "Multipass", "vendor": "Canonical", "versions": [{"lessThan": "1.16.3", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@ubuntu.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:canonical:multipass:*:*:*:*:*:*:*:*", "matchCriteriaId": "633AA429-4296-43D2-8F9F-D5115F121BD3", "versionEndExcluding": "1.16.3", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in Canonical Multipass for macOS before version 1.16.3 due to an incomplete fix for CVE-2025-5199. While the patch in version 1.16.0 updated the ownership of the multipassd daemon binary to root:wheel, five co-located binaries (multipass, qemu-img, qemu-system-aarch64, qemu-system-x86_64, and sshfs_server) in /Library/Application Support/com.canonical.multipass/bin/ retain ownership by the installing user and remain writable. Because the root LaunchDaemon (com.canonical.multipassd.plist) configures a PATH environment variable that prioritizes this user-writable directory and invokes these auxiliary binaries by their bare names, a local attacker can replace an auxiliary binary (such as qemu-img) with a malicious wrapper. When the root daemon subsequently triggers the binary during routine execution (e.g., via multipass launch), the malicious code executes with root privileges, leading to local privilege escalation."}, {"lang": "es", "value": "Se descubri\u00f3 un problema en Canonical Multipass para macOS anterior a la versi\u00f3n 1.16.3 debido a una correcci\u00f3n incompleta para CVE-2025-5199. Si bien el parche en la versi\u00f3n 1.16.0 actualiz\u00f3 la propiedad del binario del demonio multipassd a root:wheel, cinco binarios colocalizados (multipass, qemu-img, qemu-system-aarch64, qemu-system-x86_64 y sshfs_server) en /Library/Application Support/com.canonical.multipass/bin/ conservan la propiedad del usuario que los instal\u00f3 y permanecen escribibles. Debido a que el LaunchDaemon ra\u00edz (com.canonical.multipassd.plist) configura una variable de entorno PATH que prioriza este directorio escribible por el usuario e invoca estos binarios auxiliares por sus nombres simples, un atacante local puede reemplazar un binario auxiliar (como qemu-img) con un envoltorio malicioso. Cuando el demonio ra\u00edz posteriormente activa el binario durante la ejecuci\u00f3n rutinaria (por ejemplo, a trav\u00e9s de multipass launch), el c\u00f3digo malicioso se ejecuta con privilegios de root, lo que lleva a una escalada de privilegios local."}], "id": "CVE-2026-49237", "lastModified": "2026-10-14T20:10:00.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "security@ubuntu.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49237", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-28T15:15:18.418559Z", "version": "2.0.3"}}]}, "published": "2026-05-28T14:16:24.270", "references": [{"source": "security@ubuntu.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/canonical/multipass/security/advisories/GHSA-r2xg-x32f-23c5"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-276"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

{}

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