Low
siglongjmp race condition
Type: advisorySources: OSV
libcurl provides several different backends for resolving hostnames, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2023-28320
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 16:54 UTC · Revision 1
Source evidence
libcurl provides several different backends for resolving hostnames, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.
osv:CURL-CVE-2023-28320
Complete source record
{
"id": "5abbe8f2b791b0a60d7b742cb1c2d7471fc1c0bd8d3e2a2d42388bbbb6b58dab",
"url": "https://osv.dev/vulnerability/CURL-CVE-2023-28320",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "siglongjmp race condition",
"summary": "libcurl provides several different backends for resolving hostnames, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave.",
"evidence": "osv:CURL-CVE-2023-28320",
"products": [],
"severity": "low",
"structured": {
"id": "CURL-CVE-2023-28320",
"aliases": [
"CURL-CVE-2023-28320",
"CVE-2023-28320"
],
"affected": [
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "7.9.8"
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{
"fixed": "8.1.0"
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},
{
"repo": "https://github.com/curl/curl.git",
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"database_specific": {
"source": "https://curl.se/docs/CURL-CVE-2023-28320.json",
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],
"modified": "2026-10-27T01:28:36.260008926Z",
"provider": "osv",
"references": [],
"provider_metadata": {
"CWE": {
"id": "CWE-662",
"desc": "Improper Synchronization"
},
"URL": "https://curl.se/docs/CVE-2023-28320.json",
"www": "https://curl.se/docs/CVE-2023-28320.html",
"award": {
"amount": "480",
"currency": "USD"
},
"issue": "https://hackerone.com/reports/1929597",
"affects": "lib",
"package": "curl",
"severity": "Low",
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"document_id": 459160,
"published_at": "2023-05-17T08:00:00+00:00"
}