Low
curl_mime_free stack overflow by recursion
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-92391
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:38 UTC · Revision 1
Source evidence
curl_mime_free stack overflow by recursion
core-osv · Original sourcePublished 14 Oct 2026, 08:00 UTC
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.
osv:CURL-CVE-2026-92391
Complete source record
{
"id": "6e2015fa7775ebff3a991728b34ecf7ac8a090e35cf3f209b7cca25fbd2ab072",
"url": "https://osv.dev/vulnerability/CURL-CVE-2026-92391",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "curl_mime_free stack overflow by recursion",
"summary": "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.",
"evidence": "osv:CURL-CVE-2026-92391",
"products": [],
"severity": "low",
"structured": {
"id": "CURL-CVE-2026-92391",
"aliases": [
"CURL-CVE-2026-92391",
"CVE-2026-92391"
],
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{
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"database_specific": {
"source": "https://curl.se/docs/CURL-CVE-2026-92391.json",
"vanir_signatures": [
{
"id": "CURL-CVE-2026-92391-b188b21e",
"digest": {
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"function_hash": "147015790001623118169778988213959787727"
},
"source": "https://github.com/curl/curl.git/commit/d7546809d5bd548b69ec49fca26565c8f6f0d344",
"target": {
"file": "lib/mime.c",
"function": "curl_mime_free"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CURL-CVE-2026-92391-f31947a1",
"digest": {
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"source": "https://github.com/curl/curl.git/commit/d7546809d5bd548b69ec49fca26565c8f6f0d344",
"target": {
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],
"vanir_signatures_modified": "2026-10-25T01:05:11Z"
}
}
],
"modified": "2026-10-25T01:05:11.380986709Z",
"provider": "osv",
"references": [],
"provider_metadata": {
"CWE": {
"id": "CWE-674",
"desc": "Uncontrolled Recursion"
},
"URL": "https://curl.se/docs/CVE-2026-92391.json",
"www": "https://curl.se/docs/CVE-2026-92391.html",
"issue": "https://hackerone.com/reports/4024222",
"affects": "lib",
"package": "curl",
"severity": "Low",
"last_affected": "8.22.0"
}
},
"related_cves": [
{
"value": "CVE-2026-92391",
"evidence": "/aliases"
}
],
"security_relevant": true,
"severity_evidence": "/database_specific/severity"
},
"source_id": "core-osv",
"document_id": 444350,
"published_at": "2026-10-14T08:00:00+00:00"
}