{ "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": "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", "status": "affected" } ], "defaultStatus": "unaffected" } ], "references": [ { "url": "https://curl.se/docs/CVE-2026-9547.json" }, { "url": "https://curl.se/docs/CVE-2026-9547.html" }, { "url": "https://hackerone.com/reports/3751712" } ], "x_osv": { "schema_version": "1.5.0", "id": "CURL-CVE-2026-9547", "aliases": [ "CVE-2026-9547" ], "summary": "SSH improper host validation", "modified": "2026-09-07T10:34:51.00Z", "database_specific": { "package": "curl", "affects": "lib", "URL": "https://curl.se/docs/CVE-2026-9547.json", "www": "https://curl.se/docs/CVE-2026-9547.html", "issue": "https://hackerone.com/reports/3751712", "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": "7.69.0" }, { "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": "507cf6a13db0375eadd4655b4c64710db29e9cf2" }, { "fixed": "0b8dbbc63c98777e4584cb9fbd71df3464008ad1" } ] } ], "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", "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" } } ] } }