{"id":"JLSEC-2026-711","summary":"Stack Buffer Overflow in `wc_HpkeLabeledExtract` via Oversized ECH Config","details":"Stack Buffer Overflow in `wc_HpkeLabeledExtract` via Oversized ECH Config. A vulnerability existed in wolfSSL 5.8.4 ECH (Encrypted Client Hello) support, where a maliciously crafted ECH config could cause a stack buffer overflow on the client side, leading to potential remote execution and client program crash. This could be exploited by a malicious TLS server supporting ECH. Note that ECH is off by default, and is only enabled with enable-ech.","modified":"2026-07-25T18:24:49.569524255Z","published":"2026-07-14T21:41:35.775Z","upstream":["CVE-2026-3849","GHSA-267h-vrw9-53p3","EUVD-2026-13231"],"database_specific":{"license":"CC-BY-4.0","sources":[{"id":"CVE-2026-3849","imported":"2026-07-17T22:29:02.574Z","modified":"2026-06-17T10:44:20.600Z","published":"2026-03-19T21:17:13.407Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-3849","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3849","database_specific":{"status":"Analyzed"}},{"published":"2026-03-19T21:30:25Z","url":"https://api.github.com/advisories/GHSA-267h-vrw9-53p3","html_url":"https://github.com/advisories/GHSA-267h-vrw9-53p3","id":"GHSA-267h-vrw9-53p3","imported":"2026-07-17T22:29:02.791Z","modified":"2026-03-26T18:32:29Z"},{"id":"EUVD-2026-13231","imported":"2026-07-17T22:29:08.349Z","modified":"2026-03-25T14:21:17Z","published":"2026-03-19T20:29:30Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-13231","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-13231"}]},"references":[{"type":"WEB","url":"https://github.com/advisories/GHSA-267h-vrw9-53p3"},{"type":"WEB","url":"https://github.com/wolfSSL/wolfssl/pull/9737"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3849"}],"affected":[{"package":{"name":"wolfSSL_jll","ecosystem":"Julia","purl":"pkg:julia/wolfSSL_jll?uuid=98c43586-9870-5ae5-ab22-acc77b9bbdb5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"5.7.2+0"},{"fixed":"5.9.2+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-711.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:D/RE:M/U:Amber"}]}