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CVE-2026-66402 is a certificate identity validation vulnerability in FreeRDP before 3.29.0, affecting versions up to and including 3.28.0. The flaw is present in the certificate verification and hostname processing logic in tls_verify_certificate(), tls_match_hostname(), and x509_utils_get_dns_names(). FreeRDP performs custom Common Name and DNS Subject Alternative Name matching instead of relying on OpenSSL length-aware identity validation APIs. As a result, DNS SAN values containing embedded NUL bytes can be truncated during comparison, a matching Common Name can be accepted even when DNS SAN entries are present but do not match, and IP-literal targets can be validated through DNS or Common Name matching without checking iPAddress SAN entries. These weaknesses allow improper acceptance of attacker-controlled certificates under certain conditions, undermining TLS server identity verification.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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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.