{"id":"JLSEC-2026-708","details":"Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.","modified":"2026-07-18T00:01:02.886995374Z","published":"2026-07-14T21:41:35.775Z","upstream":["CVE-2026-3549"],"database_specific":{"license":"CC-BY-4.0","sources":[{"id":"CVE-2026-3549","imported":"2026-07-17T22:28:38.102Z","modified":"2026-06-17T10:43:46.210Z","published":"2026-03-19T21:17:12.823Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-3549","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3549","database_specific":{"status":"Analyzed"}}]},"references":[{"type":"WEB","url":"https://github.com/wolfSSL/wolfssl/pull/9817"}],"affected":[{"package":{"name":"wolfSSL_jll","ecosystem":"Julia","purl":"pkg:julia/wolfSSL_jll?uuid=98c43586-9870-5ae5-ab22-acc77b9bbdb5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.9.2+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-708.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:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L/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:X/RE:X/U:X"}]}