Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling_CVE-2026-33999

{
    "lastseen": "",
    "description": "A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.",
    "published": "2026-04-23T14:53:59.414Z",
    "modified": "2026-04-23T14:53:59.414Z",
    "type": "cve",
    "title": "Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling",
    "source": "redhat",
    "references": "https://access.redhat.com/security/cve/CVE-2026-33999\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2451106",
    "id": "CVE-2026-33999",
    "bulletinFamily": "",
    "cwe": [
        "CWE-191"
    ],
    "cvelist": null,
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    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
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    "product": "Red Hat Enterprise Linux 10",
    "version": "",
    "vendor": "Red Hat",
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}