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CVE-2026-11352— QUIC zero-length UDP datagrams busy-loop

Quick assessment

Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

curl是瑞典cURL团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl 存在资源管理错误漏洞，该漏洞源于curl的QUIC UDP接收函数问题，丢弃零长度UDP数据报时计数不当，可能导致恶意HTTP/3服务器触发远程拒绝服务攻击。

AI Predicted 6.5 Difficulty: Easy EPSS 1.01% · P63

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 5

VendorProduct Version RangeStatus
curl curl 8.18.0< 8.20.1 affected
6a3d0b6d631d5e9bec797306b5b41a9f440a088d< 56eca2afb4806f1032872fa97d1834b3c1385276 affected
8.20.0 affected
8.19.0 affected
8.18.0 affected
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I. Basic Information for CVE-2026-11352

Vulnerability Information
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Vulnerability Title
QUIC zero-length UDP datagrams busy-loop
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
curl 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是瑞典cURL团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl 存在资源管理错误漏洞，该漏洞源于curl的QUIC UDP接收函数问题，丢弃零长度UDP数据报时计数不当，可能导致恶意HTTP/3服务器触发远程拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
curl curl 8.18.0 ~ 8.20.1 -
curl curl 6a3d0b6d631d5e9bec797306b5b41a9f440a088d ~ 56eca2afb4806f1032872fa97d1834b3c1385276 -
curl curl 8.20.0 -

II. Public POCs for CVE-2026-11352

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III. Intelligence Information for CVE-2026-11352

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Vendor Advisories for CVE-2026-11352 (2)

Other References for CVE-2026-11352 (1)

Same Patch Batch · curl · 2026-07-03 · 18 CVEs total

CVE-2026-10536 HTTP/2 stream-dependency tree UAF
CVE-2026-8932 incomplete mTLS config matching in conn reuse
CVE-2026-8458 wrong reuse for different services
CVE-2026-8925 SASL double-free
CVE-2026-8286 wrong STARTTLS connection reuse
CVE-2026-8927 env-set cross-proxy Digest auth state leak
CVE-2026-8926 password leak with netrc and user in URL
CVE-2026-8924 trailing dot domain super cookie
CVE-2026-12064 proto-default skips SSH verification
CVE-2026-11586 WS Auto-PONG memory exhaustion
CVE-2026-9546 sending old referer
CVE-2026-9545 exposing HTTP/3 early data
CVE-2026-9080 UAF after pause in socket callback
CVE-2026-9547 SSH improper host validation
CVE-2026-9079 stale proxy password leak
CVE-2026-11564 Native CA trust persist
CVE-2026-11856 cross-origin Digest auth state leak

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-835