{"dataType":"CVE_RECORD","dataVersion":"5.2","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"},"containers":{"cna":{"providerMetadata":{"orgId":"50d2cd11-d01a-48ed-9441-5bfce9d63b27","shortName":"wolfSSL","dateUpdated":"2026-03-19T20:20:42.608Z"},"title":"wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-125","description":"CWE-125: out-of-bounds read","type":"CWE"}]}],"affected":[{"vendor":"wolfSSL","product":"wolfSSL","platforms":["ALPN-enabled builds (HAVE_ALPN / --enable-alpn)"],"versions":[{"status":"affected","version":"0","lessThan":"5.9.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"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.","supportingMedia":[{"type":"text/html","base64":false,"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>"}]}],"references":[{"url":"https://github.com/wolfSSL/wolfssl/pull/9859","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"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"}}],"workarounds":[{"lang":"en","value":"build without ALPN support if ALPN is not required.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>build without ALPN support if ALPN is not required.</p>"}]}],"solutions":[{"lang":"en","value":"apply the fix in wolfssl/wolfssl#9859 (or upgrade to a release that includes it).","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>apply the fix in wolfssl/wolfssl#9859 (or upgrade to a release that includes it).</p>"}]}],"credits":[{"lang":"en","value":"Oleh Konko","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.1"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-21T03:33:12.087254Z","id":"CVE-2026-3547","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-21T03:33:23.444Z"}}]}}