{"id":"JLSEC-2026-731","summary":"In TLSX_EchChangeSNI, the ctx-\u003eextensions branch set extensions unconditionally even when...","details":"In TLSX_EchChangeSNI, the ctx-\u003eextensions branch set extensions unconditionally even when TLSX_Find returned NULL. This caused TLSX_UseSNI to attach the attacker-controlled publicName to the shared WOLFSSL_CTX when no inner SNI was configured. TLSX_EchRestoreSNI then failed to clean it up because its removal was gated on serverNameX != NULL. The inner ClientHello was sized before the pollution but written after it, causing TLSX_SNI_Write to memcpy 255 bytes past the allocation boundary.","modified":"2026-07-18T00:02:21.533378103Z","published":"2026-07-14T21:41:35.775Z","upstream":["CVE-2026-5503","GHSA-65xm-pfx9-g5p3","EUVD-2026-21234"],"database_specific":{"sources":[{"url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-5503","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5503","database_specific":{"status":"Analyzed"},"id":"CVE-2026-5503","imported":"2026-07-17T22:32:32.085Z","modified":"2026-06-17T10:59:08.027Z","published":"2026-04-09T23:17:01.257Z"},{"url":"https://api.github.com/advisories/GHSA-65xm-pfx9-g5p3","html_url":"https://github.com/advisories/GHSA-65xm-pfx9-g5p3","id":"GHSA-65xm-pfx9-g5p3","imported":"2026-07-17T22:32:32.246Z","modified":"2026-04-27T18:32:02Z","published":"2026-04-10T00:30:31Z"},{"imported":"2026-07-17T22:32:42.161Z","modified":"2026-04-10T17:58:51Z","published":"2026-04-09T22:35:39Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-21234","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-21234","id":"EUVD-2026-21234"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://github.com/advisories/GHSA-65xm-pfx9-g5p3"},{"type":"WEB","url":"https://github.com/wolfSSL/wolfssl/pull/10102"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5503"}],"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-2026-731.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:N/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:X/RE:X/U:X"}]}