Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-11352

CVE-2026-11352HIGH

curl curl — QUIC zero-length UDP datagrams busy-loop

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0072   52.1     —

AFFECTED
  Product  Versions                                    Fixed
  curl     8.18.0 –                                    —
  curl     6a3d0b6d631d5e9bec797306b5b41a9f440a088d –  —
  curl     8.20.0 –                                    —

TIMELINE
  Jun 5   Reserved by curl
  Jul 3   EXPLOIT PUBLISHED — CVE-2026-11352 (curl). Public exploit reference added.
  Jul 3   Published (CNA: curl)
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-11352 (curl). Public exploit reference added.

CWE-835 · CNA: curl · CVSS v3.1 · 3 references · NVD status: Modified

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
June 5, 2026	Reserved	Reserved by curl
July 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-11352 (curl). Public exploit reference added.
July 3, 2026	Published	Published (CNA: curl)
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-11352 (curl). Public exploit reference added.

Affected

Affected products and packages — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
curl	curl	—	8.18.0	—
curl	curl	—	6a3d0b6d631d5e9bec797306b5b41a9f440a088d	—
curl	curl	—	8.20.0	—

Weaknesses

CWE-835

References (3)

https://curl.se/docs/CVE-2026-11352.html [Patch, Vendor Advisory]
https://curl.se/docs/CVE-2026-11352.json [Vendor Advisory]
https://hackerone.com/reports/3783438 [Exploit, Issue Tracking, Third Party Advisory]

Authoritative record: CVE-2026-11352 at cve.org

Vendors: curl

Weaknesses: CWE-835

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-11352 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.