CVE-2026-9547 (GCVE-0-2026-9547)
Vulnerability from cvelistv5
Published
2026-07-03 06:18
Modified
2026-07-06 16:48
Severity ?
7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
Summary
When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the `known_hosts` file. Instead of rejecting the mismatch, the callback mechanism fails to properly enforce the restriction, allowing the connection to succeed without warning and risking a potential man-in-the-middle attack.
References
Impacted products
Vendor Product Version
curl curl Version: 8.20.0   ≤ 8.20.0
Version: 8.19.0   ≤ 8.19.0
Version: 8.18.0   ≤ 8.18.0
Version: 8.17.0   ≤ 8.17.0
Version: 8.16.0   ≤ 8.16.0
Version: 8.15.0   ≤ 8.15.0
Version: 8.14.1   ≤ 8.14.1
Version: 8.14.0   ≤ 8.14.0
Version: 8.13.0   ≤ 8.13.0
Version: 8.12.1   ≤ 8.12.1
Version: 8.12.0   ≤ 8.12.0
Version: 8.11.1   ≤ 8.11.1
Version: 8.11.0   ≤ 8.11.0
Version: 8.10.1   ≤ 8.10.1
Version: 8.10.0   ≤ 8.10.0
Version: 8.9.1   ≤ 8.9.1
Version: 8.9.0   ≤ 8.9.0
Version: 8.8.0   ≤ 8.8.0
Version: 8.7.1   ≤ 8.7.1
Version: 8.7.0   ≤ 8.7.0
Version: 8.6.0   ≤ 8.6.0
Version: 8.5.0   ≤ 8.5.0
Version: 8.4.0   ≤ 8.4.0
Version: 8.3.0   ≤ 8.3.0
Version: 8.2.1   ≤ 8.2.1
Version: 8.2.0   ≤ 8.2.0
Version: 8.1.2   ≤ 8.1.2
Version: 8.1.1   ≤ 8.1.1
Version: 8.1.0   ≤ 8.1.0
Version: 8.0.1   ≤ 8.0.1
Version: 8.0.0   ≤ 8.0.0
Version: 7.88.1   ≤ 7.88.1
Version: 7.88.0   ≤ 7.88.0
Version: 7.87.0   ≤ 7.87.0
Version: 7.86.0   ≤ 7.86.0
Version: 7.85.0   ≤ 7.85.0
Version: 7.84.0   ≤ 7.84.0
Version: 7.83.1   ≤ 7.83.1
Version: 7.83.0   ≤ 7.83.0
Version: 7.82.0   ≤ 7.82.0
Version: 7.81.0   ≤ 7.81.0
Version: 7.80.0   ≤ 7.80.0
Version: 7.79.1   ≤ 7.79.1
Version: 7.79.0   ≤ 7.79.0
Version: 7.78.0   ≤ 7.78.0
Version: 7.77.0   ≤ 7.77.0
Version: 7.76.1   ≤ 7.76.1
Version: 7.76.0   ≤ 7.76.0
Version: 7.75.0   ≤ 7.75.0
Version: 7.74.0   ≤ 7.74.0
Version: 7.73.0   ≤ 7.73.0
Version: 7.72.0   ≤ 7.72.0
Version: 7.71.1   ≤ 7.71.1
Version: 7.71.0   ≤ 7.71.0
Version: 7.70.0   ≤ 7.70.0
Version: 7.69.1   ≤ 7.69.1
Version: 7.69.0   ≤ 7.69.0
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{
  "containers": {
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      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
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              "content": {
                "id": "CVE-2026-9547",
                "options": [
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                    "Exploitation": "poc"
                  },
                  {
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-06T16:47:32.456534Z",
                "version": "2.0.3"
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          "dateUpdated": "2026-07-06T16:48:14.469Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://hackerone.com/reports/3751712"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
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            {
              "lessThanOrEqual": "8.9.1",
              "status": "affected",
              "version": "8.9.1",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "8.9.0",
              "status": "affected",
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            {
              "lessThanOrEqual": "8.8.0",
              "status": "affected",
              "version": "8.8.0",
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              "lessThanOrEqual": "8.7.1",
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              "lessThanOrEqual": "8.7.0",
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              "lessThanOrEqual": "8.6.0",
              "status": "affected",
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              "lessThanOrEqual": "8.5.0",
              "status": "affected",
              "version": "8.5.0",
              "versionType": "semver"
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              "lessThanOrEqual": "8.4.0",
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              "lessThanOrEqual": "8.3.0",
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              "lessThanOrEqual": "8.2.1",
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              "lessThanOrEqual": "8.2.0",
              "status": "affected",
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              "versionType": "semver"
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              "lessThanOrEqual": "8.1.2",
              "status": "affected",
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              "lessThanOrEqual": "8.1.1",
              "status": "affected",
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              "lessThanOrEqual": "8.1.0",
              "status": "affected",
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              "lessThanOrEqual": "7.88.1",
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              "lessThanOrEqual": "7.88.0",
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              "lessThanOrEqual": "7.87.0",
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              "lessThanOrEqual": "7.86.0",
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              "version": "7.86.0",
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              "lessThanOrEqual": "7.85.0",
              "status": "affected",
              "version": "7.85.0",
              "versionType": "semver"
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              "lessThanOrEqual": "7.84.0",
              "status": "affected",
              "version": "7.84.0",
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              "lessThanOrEqual": "7.83.1",
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              "lessThanOrEqual": "7.83.0",
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              "lessThanOrEqual": "7.82.0",
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      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Joshua Rogers (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Joshua Rogers (Aisle Research)"
        }
      ],
      "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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-297 Improper Validation of Certificate with Host Mismatch",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-03T06:18:44.499Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "name": "json",
          "url": "https://curl.se/docs/CVE-2026-9547.json"
        },
        {
          "name": "www",
          "url": "https://curl.se/docs/CVE-2026-9547.html"
        },
        {
          "name": "issue",
          "url": "https://hackerone.com/reports/3751712"
        }
      ],
      "title": "SSH improper host validation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-9547",
    "datePublished": "2026-07-03T06:18:44.499Z",
    "dateReserved": "2026-05-26T06:45:27.665Z",
    "dateUpdated": "2026-07-06T16:48:14.469Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\": {\"id\": \"CVE-2026-9547\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-06T16:47:32.456534Z\"}}}], \"references\": [{\"url\": \"https://hackerone.com/reports/3751712\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-06T16:48:09.620Z\"}}], \"cna\": {\"title\": \"SSH improper host validation\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Joshua Rogers (Aisle Research)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Joshua Rogers (Aisle Research)\"}], \"affected\": [{\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.20.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.20.0\"}, {\"status\": \"affected\", \"version\": \"8.19.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.19.0\"}, {\"status\": \"affected\", \"version\": \"8.18.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.18.0\"}, {\"status\": \"affected\", \"version\": \"8.17.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.17.0\"}, {\"status\": \"affected\", \"version\": \"8.16.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.16.0\"}, {\"status\": \"affected\", 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\"lessThanOrEqual\": \"8.4.0\"}, {\"status\": \"affected\", \"version\": \"8.3.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.3.0\"}, {\"status\": \"affected\", \"version\": \"8.2.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.2.1\"}, {\"status\": \"affected\", \"version\": \"8.2.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.2.0\"}, {\"status\": \"affected\", \"version\": \"8.1.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.2\"}, {\"status\": \"affected\", \"version\": \"8.1.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.1\"}, {\"status\": \"affected\", \"version\": \"8.1.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.0\"}, {\"status\": \"affected\", \"version\": \"8.0.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.0.1\"}, {\"status\": \"affected\", \"version\": \"8.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.0.0\"}, {\"status\": \"affected\", \"version\": \"7.88.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.88.1\"}, {\"status\": \"affected\", \"version\": \"7.88.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.88.0\"}, {\"status\": \"affected\", \"version\": \"7.87.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.87.0\"}, {\"status\": \"affected\", \"version\": \"7.86.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.86.0\"}, {\"status\": \"affected\", \"version\": \"7.85.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.85.0\"}, {\"status\": \"affected\", \"version\": \"7.84.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.84.0\"}, {\"status\": \"affected\", \"version\": \"7.83.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.83.1\"}, {\"status\": \"affected\", \"version\": \"7.83.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.83.0\"}, {\"status\": \"affected\", \"version\": \"7.82.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.82.0\"}, {\"status\": \"affected\", \"version\": \"7.81.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.81.0\"}, {\"status\": \"affected\", \"version\": \"7.80.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.80.0\"}, {\"status\": \"affected\", \"version\": \"7.79.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.79.1\"}, {\"status\": \"affected\", \"version\": \"7.79.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.79.0\"}, {\"status\": \"affected\", \"version\": \"7.78.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.78.0\"}, {\"status\": \"affected\", \"version\": \"7.77.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.77.0\"}, {\"status\": \"affected\", \"version\": \"7.76.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.76.1\"}, {\"status\": \"affected\", \"version\": \"7.76.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.76.0\"}, {\"status\": \"affected\", \"version\": \"7.75.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.75.0\"}, {\"status\": \"affected\", \"version\": \"7.74.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.74.0\"}, {\"status\": \"affected\", \"version\": \"7.73.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.73.0\"}, {\"status\": \"affected\", \"version\": \"7.72.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.72.0\"}, {\"status\": \"affected\", \"version\": \"7.71.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.71.1\"}, {\"status\": \"affected\", \"version\": \"7.71.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.71.0\"}, {\"status\": \"affected\", \"version\": \"7.70.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.70.0\"}, {\"status\": \"affected\", \"version\": \"7.69.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.69.1\"}, {\"status\": \"affected\", \"version\": \"7.69.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.69.0\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-9547.json\", \"name\": \"json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-9547.html\", \"name\": \"www\"}, {\"url\": \"https://hackerone.com/reports/3751712\", \"name\": \"issue\"}], \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-297 Improper Validation of Certificate with Host Mismatch\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-07-03T06:18:44.499Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-9547\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-06T16:48:14.469Z\", \"dateReserved\": \"2026-05-26T06:45:27.665Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-07-03T06:18:44.499Z\", \"assignerShortName\": \"curl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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