{"id":"CVE-2026-3547","state":"PUBLISHED","title":"wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation","description":"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.","publishedAt":"2026-03-19T20:20:42.608Z","updatedAt":"2026-03-21T03:33:23.444Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"wolfSSL"},"assigner":"wolfSSL","products":["wolfSSL wolfSSL"],"affected":[{"vendor":"wolfSSL","product":"wolfSSL","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"5.9.0","versionType":"semver"}],"platforms":["ALPN-enabled builds (HAVE_ALPN / --enable-alpn)"]}],"references":["https://github.com/wolfSSL/wolfssl/pull/9859"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:11:50.837Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/3xxx/CVE-2026-3547.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-3547","state":"PUBLISHED","datePublished":"2026-03-19T20:20:42.608Z","dateUpdated":"2026-03-21T03:33:23.444Z","assignerShortName":"wolfSSL","assignerOrgId":"50d2cd11-d01a-48ed-9441-5bfce9d63b27","dateReserved":"2026-03-04T18:38:04.989Z"},"containers":{"cna":{"title":"wolfSSL: out-of-bounds read (DoS) in ALPN parsing due to incomplete validation","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."}],"affected":[{"vendor":"wolfSSL","product":"wolfSSL","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"5.9.0","versionType":"semver"}],"platforms":["ALPN-enabled builds (HAVE_ALPN / --enable-alpn)"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: out-of-bounds read","type":"CWE"}]}],"providerMetadata":{"shortName":"wolfSSL","orgId":"50d2cd11-d01a-48ed-9441-5bfce9d63b27","dateUpdated":"2026-03-19T20:20:42.608Z"},"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":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-21T03:33:23.444Z"}}]}}}