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  4. CVE 2026 117666 sslverifyfun partial label wildcard certificate
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Back to active CVEs
Critical · CVSS 9.1CVE-2026-117666

ssl_verify_fun: partial-label wildcard certificate matches hostnames across a label boundaryCVE-2026-117666

Answer in brief

CVE-2026-117666 records a Critical severity (CVSS 9.1) vulnerability in ssl_verify_fun: partial-label wildcard certificate matches hostnames across a label boundary. The current sources do not mark it as known exploited. The current feed maps deadtrickster/deadtrickster/ssl_verify_fun.erl (generic), deadtrickster/ssl_verify_fun (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 30, 2026Updated Oct 30, 2026Source checked Oct 30, 2026First seen by HOL Oct 30, 2026Material review Oct 30, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.1
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps deadtrickster/deadtrickster/ssl_verify_fun.erl (generic), deadtrickster/ssl_verify_fun (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
deadtrickster/deadtrickster/ssl_verify_fun.erlgeneric>=a49ca56923356c7a3981692b23c42ef32c2990e0 <ca34031299cd2e0c98794c0da4ba556b94e39aadca34031299cd2e0c98794c0da4ba556b94e39aad
deadtrickster/ssl_verify_fungeneric>=1.0.1 <1.1.81.1.8

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for deadtrickster/deadtrickster/ssl_verify_fun.erl, deadtrickster/ssl_verify_fun.
  2. 2Review the reported fix. Source-reported workaround: On Erlang/OTP 21 or later, keep server_name_indication set to the target hostname and pass {customize_hostname_check, [{match_fun, public_key:pkix_verify_hostname_match_fun(https)}]} in the ssl options. The hostname check in ssl then rejects the mismatch before ssl_verify_fun runs, and legitimate wildcard certificates continue to match. hackney and tls_certificate_check already set both options.

Evidence timeline and material changes

  1. Published upstream

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 30, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-297
Source
CVE List V5
Source checked
Oct 30, 2026
References
6 linked sources
Open source record