{
    "id": "CVE-2026-56766",
    "published": "2026-06-25 19:16:43",
    "last_modified": "2026-07-14 22:17:20",
    "cvss_score": "8.8",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
    "cwe": "CWE-121",
    "description": "Hydra through 9.7, fixed in commit 9cc84c2, contains a stack buffer overflow in NTLM authentication across SMTP, POP3, IMAP, NNTP, HTTP, HTTP-Proxy, and HTTP-Proxy-Urlenum modules when processing malicious NTLM Type-2 challenges. A malicious server can send a crafted NTLM Type-2 challenge with an excessively long domain string, causing base64-encoded response data to overflow a 500-byte stack buffer by 18 to 330 bytes, enabling remote code execution on systems without stack protection.",
    "epss_score": "0.02438",
    "epss_percentile": "0.83822",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-09 18:17:57",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "52622",
            "title": "Hydra - Stack Buffer Overflow",
            "date": "2026-07-07",
            "url": "https://www.exploit-db.com/exploits/52622"
        }
    ],
    "refs_list": [
        "https://github.com/vanhauser-thc/thc-hydra/commit/9cc84c20e75f5fef6bb1790bb9ada2afad2204e2",
        "https://www.vulncheck.com/advisories/hydra-stack-buffer-overflow-in-ntlm-authentication-handler"
    ]
}