CVE-2026-117666

{
  "id": "CVE-2026-117666",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
  "published": "2026-10-30T21:16:51.447",
  "lastModified": "2026-10-30T21:16:51.447",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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.\n\nErlang/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.\n\nThis issue affects ssl_verify_fun: from 1.0.1 before 1.1.8."
    }
  ],
  "affected": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "vendor": "deadtrickster",
          "product": "ssl_verify_fun",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.hex.pm",
          "packageName": "ssl_verify_fun",
          "cpes": [
            "cpe:2.3:a:deadtrickster:ssl_verify_fun:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "ssl_verify_hostname"
          ],
          "programFiles": [
            "src/ssl_verify_hostname.erl"
          ],
          "programRoutines": [
            {
              "name": "ssl_verify_hostname:try_match_wildcard/4"
            },
            {
              "name": "ssl_verify_hostname:try_match_hostname/2"
            },
            {
              "name": "ssl_verify_hostname:verify_cert_hostname/2"
            },
            {
              "name": "ssl_verify_hostname:verify_fun/3"
            }
          ],
          "repo": "https://github.com/deadtrickster/ssl_verify_fun.erl",
          "packageURL": "pkg:hex/ssl_verify_fun",
          "versions": [
            {
              "version": "1.0.1",
              "lessThan": "1.1.8",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "deadtrickster",
          "product": "ssl_verify_fun",
          "defaultStatus": "unaffected",
          "collectionURL": "https://github.com",
          "packageName": "deadtrickster/ssl_verify_fun.erl",
          "cpes": [
            "cpe:2.3:a:deadtrickster:ssl_verify_fun:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "ssl_verify_hostname"
          ],
          "programFiles": [
            "src/ssl_verify_hostname.erl"
          ],
          "programRoutines": [
            {
              "name": "ssl_verify_hostname:try_match_wildcard/4"
            },
            {
              "name": "ssl_verify_hostname:try_match_hostname/2"
            },
            {
              "name": "ssl_verify_hostname:verify_cert_hostname/2"
            },
            {
              "name": "ssl_verify_hostname:verify_fun/3"
            }
          ],
          "repo": "https://github.com/deadtrickster/ssl_verify_fun.erl",
          "packageURL": "pkg:github/deadtrickster/ssl_verify_fun.erl",
          "versions": [
            {
              "version": "a49ca56923356c7a3981692b23c42ef32c2990e0",
              "lessThan": "ca34031299cd2e0c98794c0da4ba556b94e39aad",
              "versionType": "git",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "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",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-297"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-117666.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/deadtrickster/ssl_verify_fun.erl/commit/a49ca56923356c7a3981692b23c42ef32c2990e0",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/deadtrickster/ssl_verify_fun.erl/commit/ca34031299cd2e0c98794c0da4ba556b94e39aad",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/deadtrickster/ssl_verify_fun.erl/pull/33",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/deadtrickster/ssl_verify_fun.erl/security/advisories/GHSA-7gw2-hphm-c5px",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-117666",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ]
}