Deadtrickster Ssl Verify Fun up to 1.1.7 Hostname Verification ssl_verify_hostname.erl try_match_wildcard certificate validation

Summaryinfo

A vulnerability has been found in Deadtrickster Ssl Verify Fun up to 1.1.7 and classified as problematic. Affected by this issue is the function try_match_wildcard of the file src/ssl_verify_hostname.erl of the component Hostname Verification. This manipulation causes certificate validation. This vulnerability is tracked as CVE-2026-117666. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Deadtrickster Ssl Verify Fun up to 1.1.7. It has been declared as problematic. Affected by this vulnerability is the function try_match_wildcard of the file src/ssl_verify_hostname.erl of the component Hostname Verification. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-117666 since 10/30/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1587.003 for this issue.

Upgrading to version 1.1.8 eliminates this vulnerability.

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Productinfo

Vendor

• Deadtrickster

Name

• Ssl Verify Fun

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7

CPE 2.3info

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CPE 2.2info

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