CVE-2026-9547

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-9547", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-05-26T06:45:27.665Z", "datePublished": "2026-07-03T06:18:44.499Z", "dateUpdated": "2026-09-15T06:03:34.802Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-09-15T06:03:34.802Z"}, "title": "SSH improper host validation", "descriptions": [{"lang": "en", "value": "When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack."}], "affected": [{"vendor": "curl", "product": "curl", "versions": [{"version": "7.69.0", "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": "507cf6a13db0375eadd4655b4c64710db29e9cf2", "status": "affected", "versionType": "git", "lessThan": "0b8dbbc63c98777e4584cb9fbd71df3464008ad1"}], "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": 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"7.86.0", "7.85.0", "7.84.0", "7.83.1", "7.83.0", "7.82.0", "7.81.0", "7.80.0", "7.79.1", "7.79.0", "7.78.0", "7.77.0", "7.76.1", "7.76.0", "7.75.0", "7.74.0", "7.73.0", "7.72.0", "7.71.1", "7.71.0", "7.70.0", "7.69.1", "7.69.0"]}], "credits": [{"name": "Joshua Rogers (Aisle Research)", "type": "finder"}, {"name": "Joshua Rogers (Aisle Research)", "type": "remediation developer"}], "details": "When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack."}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Validation of Certificate with Host Mismatch", "cweId": "CWE-297", "type": "CWE"}]}], "credits": [{"lang": "en", "value": "Joshua Rogers (Aisle Research)", "type": "finder"}, {"lang": "en", "value": "Joshua Rogers (Aisle Research)", "type": "remediation developer"}], "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"references": [{"url": "https://hackerone.com/reports/3751712", "tags": ["exploit"]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-07-06T16:47:32.456534Z", "id": "CVE-2026-9547", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-06T16:48:14.469Z"}}]}}

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This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "curl", "vendor": "curl", "versions": [{"lessThan": "8.14.2", "status": "affected", "version": "7.69.0", "versionType": "semver"}, {"lessThan": "8.16.1", "status": "affected", "version": "8.15.0", "versionType": "semver"}, {"lessThan": "8.20.1", "status": "affected", "version": "8.17.0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "product": "curl", "repo": "https://github.com/curl/curl.git", "vendor": "curl", "versions": [{"lessThan": "0b8dbbc63c98777e4584cb9fbd71df3464008ad1", "status": "affected", "version": "507cf6a13db0375eadd4655b4c64710db29e9cf2", "versionType": "git"}]}, {"defaultStatus": "unaffected", "product": "curl", "vendor": "curl", "versions": [{"status": "affected", "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", "version": "7.80.0"}, {"status": "affected", "version": "7.79.1"}, {"status": "affected", "version": "7.79.0"}, {"status": "affected", "version": "7.78.0"}, {"status": "affected", "version": "7.77.0"}, {"status": "affected", "version": "7.76.1"}, {"status": "affected", "version": "7.76.0"}, {"status": "affected", "version": "7.75.0"}, {"status": "affected", "version": "7.74.0"}, {"status": "affected", "version": "7.73.0"}, {"status": "affected", "version": "7.72.0"}, {"status": "affected", "version": "7.71.1"}, {"status": "affected", "version": "7.71.0"}, {"status": "affected", "version": "7.70.0"}, {"status": "affected", "version": "7.69.1"}, {"status": "affected", "version": "7.69.0"}]}], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*", "matchCriteriaId": "384FD0B4-826D-4A6C-9F78-BC25B9039011", "versionEndExcluding": "8.21.0", "versionStartIncluding": "7.69.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack."}], "id": "CVE-2026-9547", "lastModified": "2026-09-15T07:16:35.310", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-9547", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-06T16:47:32.456534Z", "version": "2.0.3"}}]}, "published": "2026-07-03T07:16:25.990", "references": [{"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "tags": ["Patch", "Vendor Advisory"], "url": "https://curl.se/docs/CVE-2026-9547.html"}, {"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "tags": ["Vendor Advisory"], "url": "https://curl.se/docs/CVE-2026-9547.json"}, {"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://hackerone.com/reports/3751712"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://hackerone.com/reports/3751712"}], "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-297"}], "source": "2499f714-1537-4658-8207-48ae4bb9eae9", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "curl: curl: Man-in-the-middle attack via SSH host key bypass", "id": "2496758", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496758"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-347", "details": ["When a libcurl-based application performs transfers via `SCP://` or `SFTP://`\nand utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an\nuntrusted server. This vulnerability occurs when a server presents a host key\ntype that does not match the specific key type already recorded for that host\nin the `known_hosts` file. Instead of rejecting the mismatch, the callback\nmechanism fails to properly enforce the restriction, allowing the connection\nto succeed without warning and risking a potential man-in-the-middle attack.", "A flaw was found in curl. When a libcurl-based application uses SCP:// or SFTP:// for transfers and employs the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an untrusted server. This occurs if the server's host key type differs from the one stored in the known_hosts file. The callback mechanism fails to enforce the host key restriction, enabling a connection to an untrusted server and risking a man-in-the-middle attack."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-9547", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "curl", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "rust", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/code-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:2", "fix_state": "Affected", "package_name": "rhtpa/rhtpa-trustification-service-rhel9", "product_name": "Red Hat Trusted Profile Analyzer"}], "public_date": "2026-07-03T06:18:44Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-9547\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-9547\nhttps://curl.se/docs/CVE-2026-9547.html\nhttps://curl.se/docs/CVE-2026-9547.json\nhttps://hackerone.com/reports/3751712"], "statement": "This is an Important flaw where libcurl-based applications performing SCP or SFTP transfers with the CURLOPT_SSH_KEYFUNCTION callback may silently accept an untrusted server. This occurs when a server presents a host key type that differs from the one recorded in the known_hosts file, bypassing a critical host key verification and enabling potential man-in-the-middle attacks. The vulnerability requires specific application callback usage, not a general curl client default.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.69.0,8.20.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "curl", "source": "cna", "vendor": "curl"}, "product": "curl", "vendor": "curl"}], "created": "2026-07-03T08:15:06.570403+00:00", "updated": "2026-09-21T07:15:07.282910+00:00", "vendors": ["curl", "curl$PRODUCT$curl"], "weaknesses": ["CWE-297", "CWE-347"]}