Low
HTTP Proxy deny use after free
Type: advisorySources: OSV
curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations using an appropriate HTTP error response code. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2022-43552
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:37 UTC · Revision 1
Source evidence
curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations using an appropriate HTTP error response code. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.
osv:CURL-CVE-2022-43552
Complete source record
{
"id": "82d2366d77b9d2ed4e7cd54bfb5f840028f34a5c653e1eca06e22c4074fd7598",
"url": "https://osv.dev/vulnerability/CURL-CVE-2022-43552",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "HTTP Proxy deny use after free",
"summary": "curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations using an appropriate HTTP error response code. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.",
"evidence": "osv:CURL-CVE-2022-43552",
"products": [],
"severity": "low",
"structured": {
"id": "CURL-CVE-2022-43552",
"aliases": [
"CURL-CVE-2022-43552",
"CVE-2022-43552"
],
"affected": [
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "7.16.0"
},
{
"fixed": "7.87.0"
}
]
},
{
"repo": "https://github.com/curl/curl.git",
"type": "GIT",
"events": [
{
"introduced": "b7eeb6e67fca686f840eacd6b8394edb58b07482"
},
{
"fixed": "4f20188ac644afe174be6005ef4f6ffba232b8b2"
}
]
}
],
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],
"database_specific": {
"source": "https://curl.se/docs/CURL-CVE-2022-43552.json",
"vanir_signatures": [
{
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"source": "https://github.com/curl/curl.git/commit/4f20188ac644afe174be6005ef4f6ffba232b8b2",
"target": {
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{
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"source": "https://github.com/curl/curl.git/commit/4f20188ac644afe174be6005ef4f6ffba232b8b2",
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"vanir_signatures_modified": "2026-10-25T01:04:45Z"
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],
"modified": "2026-10-25T01:04:45.314557945Z",
"provider": "osv",
"references": [],
"provider_metadata": {
"CWE": {
"id": "CWE-416",
"desc": "Use After Free"
},
"URL": "https://curl.se/docs/CVE-2022-43552.json",
"www": "https://curl.se/docs/CVE-2022-43552.html",
"issue": "https://hackerone.com/reports/1764858",
"affects": "both",
"package": "curl",
"severity": "Low",
"last_affected": "7.86.0"
}
},
"related_cves": [
{
"value": "CVE-2022-43552",
"evidence": "/aliases"
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],
"security_relevant": true,
"severity_evidence": "/database_specific/severity"
},
"source_id": "core-osv",
"document_id": 444285,
"published_at": "2022-12-21T08:00:00+00:00"
}