CVE-2026-117666
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
The ssl_verify_fun library (deadtrickster) improperly validates certificates with host mismatch because try_match_wildcard/4 in src/ssl_verify_hostname.erl anchors only the text before and after the * in an identifier such as f*.example.net. This causes the wildcard to also consume dots, so the certificate is accepted for f.evil.example.net, and *.168.1.1 matches the IP literal 192.168.1.1. The issue affects versions from 1.0.1 before 1.1.8.
Risk Assessment
A man-in-the-middle attacker can impersonate a TLS peer using a certificate with a partial-label wildcard, potentially intercepting credentials and traffic. Exposed are clients that disable SNI, servers that verify client certificate hostnames, and direct callers of verify_cert_hostname/2.
Recommendation
Update ssl_verify_fun to version 1.1.8 or later. Check whether applications disable SNI or rely on this library for hostname verification.
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Original NVD description (English source)
Improper Validation of Certificate with Host Mismatch vulnerability in deadtrickster ssl_verify_fun allows an adversary in the middle to impersonate a TLS peer via a certificate that carries a partial-label wildcard. try_match_wildcard/4 in src/ssl_verify_hostname.erl anchors only the text before and after the * of an identifier such as f*.example.net, so the wildcard also consumes dots and the certificate is accepted for f.evil.example.net. RFC 6125 confines a wildcard to the left-most label. The same matcher lets *.168.1.1 match the IP literal 192.168.1.1. Whole-label wildcards are matched correctly. Erlang/OTP 20.0 and later check the hostname in ssl before a user verify_fun sees valid_peer, so a client that keeps server_name_indication set rejects the mismatch regardless. Exposed are clients that disable SNI, servers that verify client certificate hostnames with this library, and direct callers of verify_cert_hostname/2. This issue affects ssl_verify_fun: from 1.0.1 before 1.1.8.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS