{"id":"JLSEC-2026-668","details":"wolfSSL through 5.0.0 allows an attacker to cause a denial of service and infinite loop in the client component by sending crafted traffic from a Machine-in-the-Middle (MITM) position. The root cause is that the client module accepts TLS messages that normally are only sent to TLS servers.","modified":"2026-07-18T00:02:19.783843762Z","published":"2026-07-14T21:41:35.775Z","upstream":["CVE-2021-44718"],"database_specific":{"sources":[{"html_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-44718","database_specific":{"status":"Modified"},"id":"CVE-2021-44718","imported":"2026-07-17T22:22:34.689Z","modified":"2026-06-17T04:12:45.727Z","published":"2022-09-02T12:15:09.337Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-44718"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://github.com/wolfSSL/wolfssl/releases"},{"type":"WEB","url":"https://www.wolfssl.com/docs/security-vulnerabilities/"}],"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":"5.7.2+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-668.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}