CVE-2026-87865
Full vulnerability record from the local CVENow database.
Description
When libcurl uses libssh2 with a hashed `known_hosts` file, an unrelated initial entry can cause host key validation to report a key *mismatch* as a *missing* key to the `CURLOPT_SSH_KEYFUNCTION` callback.
Severity
HIGH
CVSS score
7.4
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
2499f714-1537-4658-8207-48ae4bb9eae9
Published
2026-10-20 21:17:20.693000
Last modified
2026-10-30 12:16:46.393000
View original CVE JSON
{
"id": "CVE-2026-87865",
"sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
"published": "2026-10-20T21:17:20.693",
"lastModified": "2026-10-30T12:16:46.393",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "When libcurl uses libssh2 with a hashed `known_hosts` file, an unrelated\ninitial entry can cause host key validation to report a key *mismatch* as a\n*missing* key to the `CURLOPT_SSH_KEYFUNCTION` callback."
}
],
"affected": [
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"affectedData": [
{
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}
],
"metrics": {
"cvssMetricV31": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 2.2,
"impactScore": 5.2
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-30T12:08:42.701402Z",
"id": "CVE-2026-87865",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
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"type": "Secondary",
"description": [
{
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"value": "CWE-295"
}
]
}
],
"references": [
{
"url": "https://curl.se/docs/CVE-2026-87865.html",
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
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"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
"url": "https://hackerone.com/reports/3975408",
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
]
}