QUIC zero-length UDP datagrams busy-loop

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-11352
StatePUBLISHED
Assignercurl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-03 07:16:23 UTC
Updated2026-09-15 07:16:25 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

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.007150000 probability, percentile 0.518520000 (date 2026-09-15)

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

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Haxx Curl All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Curl Curl affected 8.18.0 8.20.1 semver Not specified
CNA Curl Curl affected 6a3d0b6d631d5e9bec797306b5b41a9f440a088d 56eca2afb4806f1032872fa97d1834b3c1385276 git Not specified
CNA Curl Curl affected 8.20.0 Not specified
CNA Curl Curl affected 8.19.0 Not specified
CNA Curl Curl affected 8.18.0 Not specified

References

ReferenceSourceLinkTags
hackerone.com/reports/3783438 134c704f-9b21-4f2e-91b3-4a467353bcc0 hackerone.com Exploit, Issue Tracking, Third Party Advisory
curl.se/docs/CVE-2026-11352.html 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se Patch, Vendor Advisory
curl.se/docs/CVE-2026-11352.json 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se Vendor Advisory
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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