An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can continuously stream empty datagrams to indefinitely stall the client.
{
"cna_assigner": "curl",
"cwe_ids": [
"CWE-835"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11352.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"introduced": "8.18.0"
},
{
"fixed": "8.20.1"
},
{
"introduced": "6a3d0b6d631d5e9bec797306b5b41a9f440a088d"
},
{
"fixed": "56eca2afb4806f1032872fa97d1834b3c1385276"
}
],
"source": "AFFECTED_FIELD"
}
]
}{
"cpe": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
"extracted_events": [
{
"introduced": "8.20.0"
},
{
"last_affected": "8.20.0"
},
{
"introduced": "8.19.0"
},
{
"last_affected": "8.19.0"
},
{
"introduced": "8.18.0"
},
{
"last_affected": "8.18.0"
},
{
"fixed": "8.21.0"
}
],
"source": [
"AFFECTED_FIELD",
"CPE_RANGE"
]
}