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CVE-2026-33810 is an improper validation flaw in Go's crypto/x509 certificate-chain verification. While processing excluded DNS name constraints, crypto/x509 fails to correctly apply a constraint to a wildcard DNS Subject Alternative Name when the wildcard SAN uses casing different from that of the constraint. Consequently, a certificate chain that should be rejected under an excluded DNS constraint can be accepted. The issue affects verification of otherwise trusted chains rooted in a CA present in VerifyOptions.Roots or the system certificate pool.
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No public exploit code observed for this vulnerability.
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51 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Go crypto/x509 certificate-validation bypass caused by incorrect application of DNS constraints.
A Go crypto/x509 certificate-validation bypass caused by incorrect application of DNS constraints.
A remotely exploitable, low-complexity vulnerability with no privileges or user interaction required, affecting confidentiality at high impact and integrity at low impact according to the supplied CVSS v3 vector.
A vulnerability addressed by an Oracle Linux security update affecting the go-fdo-client package on Oracle Linux 10.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.