{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-129482", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-15T13:41:09.589Z", "datePublished": "2026-11-15T13:47:24.248Z", "dateUpdated": "2026-11-15T13:47:24.248Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-15T13:47:24.248Z"}, "datePublic": "2026-08-22T00:00:00.000Z", "title": "OkHttp through 5.5.1 Certificate Pinning Bypass via Trailing-Dot Hostname", "descriptions": [{"lang": "en", "value": "OkHttp through 5.5.1 contains an improper certificate validation vulnerability in CertificatePinner that skips pin checks because Pin.matchesHostname does not normalize trailing-dot hostnames. Network attackers with a CA-trusted certificate not matching configured pins can intercept or modify TLS traffic when applications request the trailing-dot form of pinned hosts."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Certificate Validation", "cweId": "CWE-295", "type": "CWE"}]}], "affected": [{"vendor": "Square", "product": "OkHttp", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThanOrEqual": "5.5.1", "status": "affected", "versionType": "semver"}], "packageURL": "pkg:maven/com.squareup.okhttp3/okhttp", "repo": "https://github.com/lysine-dev/okhttp"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:squareup:okhttp:*:*:*:*:*:*:*:*", "versionEndIncluding": "5.5.1"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/lysine-dev/okhttp/issues/9724", "tags": ["issue-tracking"]}, {"url": "https://github.com/lysine-dev/okhttp/pull/9734", "tags": ["patch", "issue-tracking"]}, {"url": "https://github.com/lysine-dev/okhttp/commit/30aa589761a9b4f5fe84c00e21e5ab44b22bd7c1", "tags": ["patch"]}, {"url": "https://github.com/lysine-dev/okhttp/blob/parent-5.5.1/okhttp/src/commonJvmAndroid/kotlin/okhttp3/CertificatePinner.kt#L293-L314", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: OkHttp through 5.5.1 Certificate Pinning Bypass via Trailing-Dot Hostname", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/okhttp-through-5.5.1-certificate-pinning-bypass-via-trailing-dot-hostname"}], "credits": [{"lang": "en", "value": "Joshua Rogers", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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