| Package | Affected versions | Patched versions |
|---|---|---|
| curl | ≥ 8.18.0, < 8.21.0 | 8.21.0 |
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.
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