Cursor Desktop sandbox escape via symlink and failed path canonicalization_CVE-2026-50549

{
    "lastseen": "",
    "description": "Cursor is a code editor built for programming with AI. Prior to 3.0, Cursor runs agent terminal commands in a sandbox by default. Before a Write, the agent canonicalizes the target path to confirm it stays inside the workspace, but when canonicalization fails it falls back to the original path and writes without approval. A malicious agent can create an in-workspace symlink that points outside the workspace and force canonicalization to fail \u2014 either because the target does not exist or because read permission is removed from the path \u2014 so the agent writes through the symlink to an arbitrary location without approval. A malicious agent could write arbitrary files outside the workspace under the user's privileges. This enables non-sandboxed Remote Code Execution \u2014 for example by overwriting the cursorsandbox helper so later commands run unsandboxed \u2014 with no user interaction beyond a benign prompt. This vulnerability is fixed in 3.0.",
    "published": "2026-06-25T18:47:45.070Z",
    "modified": "2026-06-25T19:02:41.108Z",
    "type": "cve",
    "title": "Cursor Desktop sandbox escape via symlink and failed path canonicalization",
    "source": "GitHub_M",
    "references": "https://github.com/cursor/cursor/security/advisories/GHSA-3v8f-48vw-3mjx",
    "id": "CVE-2026-50549",
    "bulletinFamily": "",
    "cwe": [
        "CWE-59"
    ],
    "cvelist": null,
    "sourceData": "cursor cursor < 3.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "cursor",
    "version": "< 3.0",
    "vendor": "cursor",
    "ai_description": "Sandbox escape via symlink and failed path canonicalization, allowing arbitrary file writes and non-sandboxed Remote Code Execution",
    "ai_severity": "Critical",
    "ai_vendor": "Cursor",
    "ai_product": "Cursor Desktop",
    "ai_version": "< 3.0",
    "ai_score": 9.3
}