{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-12064", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-06-12T07:23:29.455Z", "datePublished": "2026-07-03T06:13:55.302Z", "dateUpdated": "2026-09-15T06:02:44.283Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-09-15T06:02:44.283Z"}, "title": "proto-default skips SSH verification", "descriptions": [{"lang": "en", "value": "When a user invokes curl using a schemeless URL combined with\n`--proto-default` sftp (or scp), a disconnect occurs between the tool layer\nand libcurl. The tool layer incorrectly infers the URL scheme, which\nerroneously bypasses the initialization of critical SSH security options like\nCURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the\nlibcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes\nthe connection via SFTP/SCP as specified. Because the tool layer skipped the\nsecurity configuration, these SSH host verification options are silently\nomitted, causing curl to connect to an unverified SSH remote host without\nthrowing an error."}], "affected": [{"vendor": "curl", "product": "curl", "versions": [{"version": "7.81.0", "status": "affected", "versionType": "semver", "lessThan": "8.14.2"}, {"version": "8.15.0", "status": "affected", "versionType": "semver", "lessThan": "8.16.1"}, {"version": "8.17.0", "status": "affected", "versionType": "semver", "lessThan": "8.20.1"}], "defaultStatus": "unaffected"}, {"vendor": "curl", "product": "curl", "versions": [{"version": "18270893abdb19f0ca170c118f8a2847dbd304be", "status": "affected", "versionType": "git", "lessThan": "ab3bb8cd8be8f9d4acb97da0418abc279182041e"}], "defaultStatus": "unaffected", "repo": "https://github.com/curl/curl.git"}, {"vendor": "curl", "product": "curl", "versions": [{"version": "8.20.0", "status": "affected"}, {"version": "8.19.0", "status": "affected"}, {"version": "8.18.0", "status": "affected"}, {"version": "8.17.0", "status": "affected"}, {"version": "8.16.0", "status": "affected"}, {"version": "8.15.0", "status": "affected"}, {"version": "8.14.1", "status": "affected"}, {"version": "8.14.0", "status": "affected"}, {"version": "8.13.0", "status": "affected"}, {"version": "8.12.1", "status": "affected"}, {"version": "8.12.0", "status": "affected"}, {"version": "8.11.1", "status": "affected"}, {"version": "8.11.0", "status": "affected"}, {"version": "8.10.1", "status": "affected"}, {"version": "8.10.0", "status": "affected"}, {"version": "8.9.1", "status": "affected"}, {"version": "8.9.0", "status": "affected"}, {"version": "8.8.0", "status": "affected"}, {"version": "8.7.1", "status": "affected"}, {"version": "8.7.0", "status": "affected"}, {"version": "8.6.0", "status": "affected"}, {"version": "8.5.0", "status": "affected"}, {"version": "8.4.0", "status": "affected"}, {"version": "8.3.0", "status": "affected"}, {"version": "8.2.1", "status": "affected"}, {"version": "8.2.0", "status": "affected"}, {"version": "8.1.2", "status": "affected"}, {"version": "8.1.1", "status": "affected"}, {"version": "8.1.0", "status": "affected"}, {"version": "8.0.1", "status": "affected"}, {"version": "8.0.0", "status": "affected"}, {"version": "7.88.1", "status": "affected"}, {"version": "7.88.0", "status": "affected"}, {"version": "7.87.0", "status": "affected"}, {"version": "7.86.0", "status": "affected"}, {"version": "7.85.0", "status": "affected"}, {"version": "7.84.0", "status": "affected"}, {"version": "7.83.1", "status": "affected"}, {"version": "7.83.0", "status": "affected"}, {"version": "7.82.0", "status": "affected"}, {"version": "7.81.0", "status": "affected"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://curl.se/docs/CVE-2026-12064.json"}, {"url": "https://curl.se/docs/CVE-2026-12064.html"}, {"url": "https://hackerone.com/reports/3797526"}], "x_osv": {"schema_version": "1.5.0", "id": "CURL-CVE-2026-12064", "aliases": ["CVE-2026-12064"], "summary": "proto-default skips SSH verification", "modified": "2026-09-07T10:34:51.00Z", "database_specific": {"package": "curl", "affects": "tool", "URL": "https://curl.se/docs/CVE-2026-12064.json", "www": "https://curl.se/docs/CVE-2026-12064.html", "issue": "https://hackerone.com/reports/3797526", "CWE": {"id": "CWE-297", "desc": "Improper Validation of Certificate with Host Mismatch"}, "last_affected": "8.20.0", "severity": "Low"}, "published": "2026-06-24T08:00:00.00Z", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "7.81.0"}, {"fixed": "8.14.2"}, {"introduced": "8.15.0"}, {"fixed": "8.16.1"}, {"introduced": "8.17.0"}, {"fixed": "8.20.1"}]}, {"type": "GIT", "repo": "https://github.com/curl/curl.git", "events": [{"introduced": "18270893abdb19f0ca170c118f8a2847dbd304be"}, {"fixed": "ab3bb8cd8be8f9d4acb97da0418abc279182041e"}]}], "versions": ["8.20.0", "8.19.0", "8.18.0", "8.17.0", "8.16.0", "8.15.0", "8.14.1", "8.14.0", "8.13.0", "8.12.1", "8.12.0", "8.11.1", "8.11.0", "8.10.1", "8.10.0", "8.9.1", "8.9.0", "8.8.0", "8.7.1", "8.7.0", "8.6.0", "8.5.0", "8.4.0", "8.3.0", "8.2.1", "8.2.0", "8.1.2", "8.1.1", "8.1.0", "8.0.1", "8.0.0", "7.88.1", "7.88.0", "7.87.0", "7.86.0", "7.85.0", "7.84.0", "7.83.1", "7.83.0", "7.82.0", "7.81.0"]}], "credits": [{"name": "alienowo on hackerone (AntAISecurityLab)", "type": "finder"}, {"name": "Daniel Stenberg", "type": "remediation developer"}], "details": "When a user invokes curl using a schemeless URL combined with\n`--proto-default` sftp (or scp), a disconnect occurs between the tool layer\nand libcurl. The tool layer incorrectly infers the URL scheme, which\nerroneously bypasses the initialization of critical SSH security options like\nCURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the\nlibcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes\nthe connection via SFTP/SCP as specified. Because the tool layer skipped the\nsecurity configuration, these SSH host verification options are silently\nomitted, causing curl to connect to an unverified SSH remote host without\nthrowing an error."}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Validation of Certificate with Host Mismatch", "cweId": "CWE-297", "type": "CWE"}]}], "credits": [{"lang": "en", "value": "alienowo on hackerone (AntAISecurityLab)", "type": "finder"}, {"lang": "en", "value": "Daniel Stenberg", "type": "remediation developer"}], "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"references": [{"url": "https://hackerone.com/reports/3797526", "tags": ["exploit"]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-07-06T18:19:34.951461Z", "id": "CVE-2026-12064", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-06T18:21:00.665Z"}}]}}