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    "cveMetadata": {
        "cveId": "CVE-2026-3547",
        "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
        "state": "PUBLISHED",
        "assignerShortName": "wolfSSL",
        "dateReserved": "2026-03-04T18:38:04.989Z",
        "datePublished": "2026-03-19T20:20:42.608Z",
        "dateUpdated": "2026-03-21T03:33:23.444Z"
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                "shortName": "wolfSSL",
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            "title": "wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation",
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                            "lang": "en",
                            "cweId": "CWE-125",
                            "description": "CWE-125: out-of-bounds read",
                            "type": "CWE"
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            "affected": [
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                    "vendor": "wolfSSL",
                    "product": "wolfSSL",
                    "platforms": [
                        "ALPN-enabled builds (HAVE_ALPN / --enable-alpn)"
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                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "5.9.0",
                            "versionType": "semver"
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            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Out-of-bounds read in ALPN parsing due to incomplete validation. wolfSSL 5.8.4 and earlier contained an out-of-bounds read in ALPN handling when built with ALPN enabled (HAVE_ALPN / --enable-alpn). A crafted ALPN protocol list could trigger an out-of-bounds read, leading to a potential process crash (denial of service). Note that ALPN is disabled by default, but is enabled for these 3rd party compatibility features: enable-apachehttpd, enable-bind, enable-curl, enable-haproxy, enable-hitch, enable-lighty, enable-jni, enable-nginx, enable-quic.",
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                            "value": "<p>Out-of-bounds read in ALPN parsing due to incomplete validation. wolfSSL 5.8.4 and earlier contained an out-of-bounds read in ALPN handling when built with ALPN enabled (HAVE_ALPN / --enable-alpn). A crafted ALPN protocol list could trigger an out-of-bounds read, leading to a potential process crash (denial of service). Note that ALPN is disabled by default, but is enabled for these 3rd party compatibility features: enable-apachehttpd, enable-bind, enable-curl, enable-haproxy, enable-hitch, enable-lighty, enable-jni, enable-nginx, enable-quic.</p>"
                        }
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                }
            ],
            "references": [
                {
                    "url": "https://github.com/wolfSSL/wolfssl/pull/9859",
                    "tags": [
                        "patch"
                    ]
                }
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                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "HIGH",
                        "baseSeverity": "HIGH",
                        "baseScore": 7.5,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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            "workarounds": [
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                    "lang": "en",
                    "value": "build without ALPN support if ALPN is not required.",
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                    "value": "apply the fix in wolfssl/wolfssl#9859 (or upgrade to a release that includes it).",
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                            "value": "<p>apply the fix in wolfssl/wolfssl#9859 (or upgrade to a release that includes it).</p>"
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            "credits": [
                {
                    "lang": "en",
                    "value": "Oleh Konko",
                    "type": "finder"
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                "discovery": "EXTERNAL"
            },
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                                "timestamp": "2026-03-21T03:33:12.087254Z",
                                "id": "CVE-2026-3547",
                                "options": [
                                    {
                                        "Exploitation": "none"
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                "title": "CISA ADP Vulnrichment",
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