{"id":"JLSEC-2026-522","details":"A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.","modified":"2026-05-26T14:30:03.273513996Z","published":"2026-05-26T14:17:50.003Z","upstream":["CVE-2021-4209"],"database_specific":{"sources":[{"modified":"2024-11-21T06:37:09.190Z","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-4209","id":"CVE-2021-4209","imported":"2026-05-22T18:34:35.098Z","database_specific":{"status":"Modified"},"published":"2022-08-24T16:15:09.927Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-4209"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2021-4209"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2021-4209"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2044156"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2044156"},{"type":"WEB","url":"https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568"},{"type":"WEB","url":"https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568"},{"type":"WEB","url":"https://gitlab.com/gnutls/gnutls/-/issues/1306"},{"type":"WEB","url":"https://gitlab.com/gnutls/gnutls/-/issues/1306"},{"type":"WEB","url":"https://gitlab.com/gnutls/gnutls/-/merge_requests/1503"},{"type":"WEB","url":"https://gitlab.com/gnutls/gnutls/-/merge_requests/1503"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20220915-0005/"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20220915-0005/"}],"affected":[{"package":{"name":"GnuTLS_jll","ecosystem":"Julia","purl":"pkg:julia/GnuTLS_jll?uuid=0951126a-58fd-58f1-b5b3-b08c7c4a876d"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.7.8+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-522.json"}}],"schema_version":"1.7.5"}