pam_usb: Command injection via $TMUX environment variable leads to RCE as root_CVE-2026-44713

{
    "lastseen": "",
    "description": "pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/tmux.c reads the user's $TMUX environment variable, splits it on commas, and interpolates the socket-path component directly into a shell command passed to popen(). Because the value is placed inside double-quotes without sanitisation, any value containing \" terminates the quoted string and injects arbitrary shell syntax. popen() runs as root inside the PAM stack. This vulnerability is fixed in 0.8.7.",
    "published": "2026-05-27T20:13:13.193Z",
    "modified": "2026-05-27T20:13:13.193Z",
    "type": "cve",
    "title": "pam_usb: Command injection via $TMUX environment variable leads to RCE as root",
    "source": "GitHub_M",
    "references": "https://github.com/mcdope/pam_usb/security/advisories/GHSA-822m-whrh-vrj8",
    "id": "CVE-2026-44713",
    "bulletinFamily": "",
    "cwe": [
        "CWE-78",
        "CWE-116"
    ],
    "cvelist": null,
    "sourceData": "mcdope pam_usb < 0.8.7",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
        "version": "3.1"
    },
    "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": "pam_usb",
    "version": "< 0.8.7",
    "vendor": "mcdope",
    "ai_description": "Command injection vulnerability via $TMUX environment variable, allowing RCE as root",
    "ai_severity": "High",
    "ai_vendor": "mcdope",
    "ai_product": "pam_usb",
    "ai_version": "< 0.8.7",
    "ai_score": 8.8
}