{"id":"DEBIAN-CVE-2026-117666","details":"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.","modified":"2026-11-04T22:00:59.528474323Z","published":"2026-10-30T21:16:51.447Z","upstream":["CVE-2026-117666"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-117666"}],"affected":[{"package":{"name":"rebar3","ecosystem":"Debian:12","purl":"pkg:deb/debian/rebar3?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.19.0-1","3.23.0-1","3.23.0-2","3.23.0-3","3.24.0-1","3.25.1-1","3.26.0-1","3.27.0-1","3.27.0-2","3.27.0-3","3.27.0-4","3.27.0-5","3.27.0-6","3.27.3-1","3.28.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-117666.json"}},{"package":{"name":"rebar3","ecosystem":"Debian:13","purl":"pkg:deb/debian/rebar3?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.24.0-1","3.25.1-1","3.26.0-1","3.27.0-1","3.27.0-2","3.27.0-3","3.27.0-4","3.27.0-5","3.27.0-6","3.27.3-1","3.28.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-117666.json"}},{"package":{"name":"rebar3","ecosystem":"Debian:14","purl":"pkg:deb/debian/rebar3?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.24.0-1","3.25.1-1","3.26.0-1","3.27.0-1","3.27.0-2","3.27.0-3","3.27.0-4","3.27.0-5","3.27.0-6","3.27.3-1","3.28.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-117666.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}