Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook_CVE-2026-42596

{
    "lastseen": "",
    "description": "Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, the default deny-lists used by Gotenberg's downloadFrom feature and webhook feature are bypassable. Because the filter is regex-based and case-sensitive, an unauthenticated attacker can supply URLs such as http://[::ffff:127.0.0.1]:... and reach loopback or private HTTP services that the default deny-list is intended to block. This crosses a real security boundary because an external caller can force the server to make outbound requests to internal-only targets. This vulnerability is fixed in 8.31.0.",
    "published": "2026-05-14T15:19:34.999Z",
    "modified": "2026-05-14T15:19:34.999Z",
    "type": "cve",
    "title": "Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook",
    "source": "GitHub_M",
    "references": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h",
    "id": "CVE-2026-42596",
    "bulletinFamily": "",
    "cwe": [
        "CWE-918"
    ],
    "cvelist": null,
    "sourceData": "gotenberg gotenberg < 8.31.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.4,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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            "integrityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "gotenberg",
    "version": "< 8.31.0",
    "vendor": "gotenberg",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}