{"schema_version":"1.9.0","id":"CVE-2026-33810","published":"2026-04-08T01:06:56.546Z","modified":"2026-09-11T03:48:21.074839202Z","aliases":["BIT-golang-2026-33810","GO-2026-4866"],"related":["ALSA-2026:19135","ALSA-2026:19353","ALSA-2026:57126","ALSA-2026:62577","ALSA-2026:62578","ALSA-2026:63332","SUSE-SU-2026:1320-1","SUSE-SU-2026:1580-1","SUSE-SU-2026:21356-1","SUSE-SU-2026:22572-1","openSUSE-SU-2026:10525-1","openSUSE-SU-2026:20571-1","openSUSE-SU-2026:20703-1","openSUSE-SU-2026:21254-1","openSUSE-SU-2026:21483-1"],"summary":"Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509","details":"When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/golang/go","events":[{"introduced":"d90b98e65320778f3b1f99a6951ab20f04d218b3"},{"fixed":"9c8bf0e72a6fb3b415b591b124b59fbb7cf92252"}],"database_specific":{"cpe":"cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.26.0"},{"fixed":"1.26.2"}],"source":"CPE_RANGE"}}],"versions":["go1.26.1","go1.26.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33810.json"}}],"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/04/19/4"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/04/20/1"},{"type":"WEB","url":"https://go.dev/cl/763763"},{"type":"WEB","url":"https://go.dev/issue/78332"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"},{"type":"WEB","url":"https://pkg.go.dev"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2026-4866"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33810.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10155"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10158"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13545"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14391"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19135"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19144"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19353"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19714"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19719"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19720"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19721"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21769"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21772"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22347"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22485"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22862"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22958"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22959"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22960"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22961"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22962"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23345"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24478"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25089"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26568"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26571"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26585"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28047"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:29854"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34192"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34196"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34197"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34365"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36651"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36796"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:39810"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40118"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:40945"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41928"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42043"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42047"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42049"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42050"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42051"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:47952"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:49702"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:49703"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:49712"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:51033"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:51288"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:54757"},{"type":"ADV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