Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow_CVE-2026-44631

{
    "lastseen": "",
    "description": "Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration.\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.\n\nUsers are recommended to upgrade to version 2.4.68, which fixes the issue.",
    "published": "2026-06-08T15:19:23.570Z",
    "modified": "2026-06-08T19:43:13.169Z",
    "type": "cve",
    "title": "Apache HTTP Server: Heap Underflow in `ap_regname` via Signed Char Overflow",
    "source": "apache",
    "references": "https://httpd.apache.org/security/vulnerabilities_24.html",
    "id": "CVE-2026-44631",
    "bulletinFamily": "",
    "cwe": [
        "CWE-124"
    ],
    "cvelist": null,
    "sourceData": "Apache Software Foundation Apache HTTP Server 2.4.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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": "Apache HTTP Server",
    "version": "2.4.0",
    "vendor": "Apache Software Foundation",
    "ai_description": "Heap Underflow vulnerability in Apache HTTP Server via crafted regular expressions",
    "ai_severity": "Critical",
    "ai_vendor": "Apache Software Foundation",
    "ai_product": "Apache HTTP Server",
    "ai_version": "2.4.0-2.4.67",
    "ai_score": 9.8
}