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CVE-2026-11352

high CVSS 7.5 EPSS 0.7%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-11352 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.20.1

At a glance

Severity
High
CVSS base score
7.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.7% probability of exploitation in the next 30 days, higher than 52% of scored vulnerabilities
Weakness
CWE-835
Published
2026-07-03
NVD CVE.org

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