CVE-2026-92391
Full vulnerability record from the local CVENow database.
Description
A deeply nested multipart MIME structure constructed via the public API causes a stack overflow in libcurl during normal cleanup operations. An excessive recursion depth within `curl_mime_free` leads to unbounded stack frame allocation during structure traversal, ultimately crashing the host process.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
2499f714-1537-4658-8207-48ae4bb9eae9
Published
2026-10-20 21:17:21.920000
Last modified
2026-10-30 17:17:31.320000
View original CVE JSON
{
"id": "CVE-2026-92391",
"sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
"published": "2026-10-20T21:17:21.920",
"lastModified": "2026-10-30T17:17:31.320",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A deeply nested multipart MIME structure constructed via the public API causes\na stack overflow in libcurl during normal cleanup operations. An excessive\nrecursion depth within `curl_mime_free` leads to unbounded stack frame\nallocation during structure traversal, ultimately crashing the host process."
}
],
"affected": [
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"affectedData": [
{
"vendor": "curl",
"product": "curl",
"defaultStatus": "unaffected",
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]
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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:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-30T16:16:09.838224Z",
"id": "CVE-2026-92391",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-674"
}
]
}
],
"references": [
{
"url": "https://curl.se/docs/CVE-2026-92391.html",
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
"url": "https://curl.se/docs/CVE-2026-92391.json",
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
"url": "https://hackerone.com/reports/4024222",
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
},
{
"url": "https://hackerone.com/reports/4024222",
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
]
}