Firebird has a buffer overflow when parsing corrupted slice packets_CVE-2026-33337

{
    "lastseen": "",
    "description": "Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.",
    "published": "2026-04-17T18:48:47.953Z",
    "modified": "2026-04-17T19:21:17.132Z",
    "type": "cve",
    "title": "Firebird has a buffer overflow when parsing corrupted slice packets",
    "source": "GitHub_M",
    "references": "https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p\nhttps://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14\nhttps://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7\nhttps://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4",
    "id": "CVE-2026-33337",
    "bulletinFamily": "",
    "cwe": [
        "CWE-120",
        "CWE-502"
    ],
    "cvelist": null,
    "sourceData": "FirebirdSQL firebird >= 3.0.0, < 3.0.14\nFirebirdSQL firebird >= 4.0.0, < 4.0.7\nFirebirdSQL firebird >= 5.0.0, < 5.0.4",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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": "firebird",
    "version": ">= 3.0.0, < 3.0.14",
    "vendor": "FirebirdSQL",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}