libssh2 – Free of Uninitialized Pointer in publickey List Cleanup_CVE-2026-58051

{
    "lastseen": "",
    "description": "libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.",
    "published": "2026-06-28T01:32:54.283Z",
    "modified": "2026-06-28T01:32:54.283Z",
    "type": "cve",
    "title": "libssh2 - Free of Uninitialized Pointer in publickey List Cleanup",
    "source": "VulnCheck",
    "references": "https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc\nhttps://github.com/libssh2/libssh2/blob/master/src/publickey.c\nhttps://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup",
    "id": "CVE-2026-58051",
    "bulletinFamily": "",
    "cwe": [
        "CWE-908"
    ],
    "cvelist": null,
    "sourceData": "libssh2 libssh2 0",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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": "libssh2",
    "version": "0",
    "vendor": "libssh2",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}