CVE-2026-117666

{"id": "CVE-2026-117666", "cveTags": [], "metrics": {"cvssMetricV40": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.1, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "affectedData": [{"cpes": ["cpe:2.3:a:deadtrickster:ssl_verify_fun:*:*:*:*:*:*:*:*"], "repo": "https://github.com/deadtrickster/ssl_verify_fun.erl", "vendor": "deadtrickster", "modules": ["ssl_verify_hostname"], "product": "ssl_verify_fun", "versions": [{"status": "affected", "version": "1.0.1", "lessThan": "1.1.8", "versionType": "semver"}], "packageURL": "pkg:hex/ssl_verify_fun", "packageName": "ssl_verify_fun", "programFiles": ["src/ssl_verify_hostname.erl"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "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"}]}, {"cpes": ["cpe:2.3:a:deadtrickster:ssl_verify_fun:*:*:*:*:*:*:*:*"], "repo": "https://github.com/deadtrickster/ssl_verify_fun.erl", "vendor": "deadtrickster", "modules": ["ssl_verify_hostname"], "product": "ssl_verify_fun", "versions": [{"status": "affected", "version": "a49ca56923356c7a3981692b23c42ef32c2990e0", "lessThan": "ca34031299cd2e0c98794c0da4ba556b94e39aad", "versionType": "git"}], "packageURL": "pkg:github/deadtrickster/ssl_verify_fun.erl", "packageName": "deadtrickster/ssl_verify_fun.erl", "programFiles": ["src/ssl_verify_hostname.erl"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "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"}]}]}], "published": "2026-10-30T21:16:51.447", "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"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "description": [{"lang": "en", "value": "CWE-297"}]}], "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."}], "lastModified": "2026-10-30T21:16:51.447", "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}