CVE-2026-11352

Description

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.

Metadata

CVE ID: CVE-2026-11352
State: PUBLISHED
Assigner: curl
Reserved: 2026-06-05 11:23 UTC
Published: 2026-07-03 06:12 UTC
Last updated: 2026-07-03 06:12 UTC
Vendor / Product: curl / curl
Sources: cve.org · NVD

Severity & Metrics

No CVSS data available.

Affected products (1)

Vendor	Product	Platform	Versions
curl	curl	—	8.20.0 ≤ 8.20.0, 8.19.0 ≤ 8.19.0, 8.18.0 ≤ 8.18.0

Weakness (CWE)

CWE	Source	Description
—	cna	CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

References (3)

json https://curl.se/docs/CVE-2026-11352.json
www https://curl.se/docs/CVE-2026-11352.html
issue https://hackerone.com/reports/3783438

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