{"schema_version":"1.9.0","id":"BIT-golang-2026-33810","published":"2026-04-13T05:43:50.259Z","modified":"2026-09-08T08:47:49.178540956Z","aliases":["CVE-2026-33810","GO-2026-4866"],"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":[{"package":{"name":"golang","ecosystem":"Bitnami","purl":"pkg:bitnami/golang"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.26.0-0"},{"fixed":"1.26.2"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/golang/BIT-golang-2026-33810.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"}]}],"references":[{"type":"FIX","url":"https://go.dev/cl/763763"},{"type":"REPORT","url":"https://go.dev/issue/78332"},{"type":"DISCUSSION","url":"https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33810"},{"type":"ADVISORY","url":"https://pkg.go.dev/vuln/GO-2026-4866"},{"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://access.redhat.com/errata/RHSA-2026:10155"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:10158"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:13545"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:14391"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19135"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19144"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19353"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19719"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19720"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19721"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:21769"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:21772"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22347"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22485"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22862"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22958"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22959"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22960"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22961"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:22962"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:23345"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:24478"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:25089"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26568"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26571"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:26585"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:28047"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:29854"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:34365"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:7291"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:9385"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-33810"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2456335"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33810.json"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:36651"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:36796"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:39810"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:40118"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:40945"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:41928"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:42043"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:42047"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:42049"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:42050"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:42051"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:47952"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:51033"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:54757"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:34192"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:34196"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:34197"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:51288"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:57126"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:19714"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:59546"},{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:49702"},{"type":"WEB","url":"https://access.redhat.com/er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