CVE-2026-117666ssl_verify_fun: partial-label wildcard certificate matches hostnames across a label boundary
Açıklama
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.
Veri: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Bilgiler kaynaktaki haliyle, İngilizce yayımlanır.
Etkilenen ürünler ve sürümler
| Üretici | Ürün | Sürümler | |
|---|---|---|---|
| deadtrickster | ssl_verify_fun | 1.0.1 – < 1.1.8 |
Kaynaklar ve yamalar
- ssl_verify_fun: partial-label wildcard certificate matches hostnames across a label boundary vendor-advisory
- EEF CNA record for CVE-2026-117666
- OSV record EEF-CVE-2026-117666
- Do not let partial-label wildcards match across label boundaries (ssl_verify_fun.erl pull request #33) patch
- Introducing commit a49ca56 in deadtrickster/ssl_verify_fun.erl
- Fix commit ca34031 in deadtrickster/ssl_verify_fun.erl patch