QUIC zero-length UDP datagrams busy-loop

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Summary

CVECVE-2026-11352
StatePUBLISHED
Assignercurl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-03 07:16:23 UTC
Updated2026-07-03 07:16:23 UTC
DescriptionAn 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.

Risk And Classification

Problem Types: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Curl Curl affected 8.20.0 8.20.0 semver Not specified
CNA Curl Curl affected 8.19.0 8.19.0 semver Not specified
CNA Curl Curl affected 8.18.0 8.18.0 semver Not specified

References

ReferenceSourceLinkTags
curl.se/docs/CVE-2026-11352.html 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
curl.se/docs/CVE-2026-11352.json 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
hackerone.com/reports/3783438 2499f714-1537-4658-8207-48ae4bb9eae9 hackerone.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: vectorqueue on hackerone (AntAISecurityLab) (en)

CNA: Stefan Eissing (en)

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