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CVE-2026-11586— WS Auto-PONG memory exhaustion

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，该漏洞源于自动响应WebSocket PING帧时缺少对未确认帧内存分配的边界，可能导致恶意服务器通过快速连续发送PING消息耗尽所有可用内存。以下版本受到影响：

AI Predicted 6.5 Difficulty: Easy EPSS 0.61% · P48

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 8

VendorProduct Version RangeStatus
curl curl 8.16.0< 8.16.1 affected
8.17.0< 8.20.1 affected
0b091328773c64e23f5c4739da74527093c6a5ab< 849317ff5c5a5e13f50ec3d001e46ddffa77d8a4 affected
8.20.0 affected
8.19.0 affected
8.18.0 affected
8.17.0 affected
8.16.0 affected
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I. Basic Information for CVE-2026-11586

Vulnerability Information
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Vulnerability Title
WS Auto-PONG memory exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper bound on memory allocation for unacknowledged frames, a malicious server can exhaust all available memory by flooding curl with rapid, sequential PING messages.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
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，该漏洞源于自动响应WebSocket PING帧时缺少对未确认帧内存分配的边界，可能导致恶意服务器通过快速连续发送PING消息耗尽所有可用内存。以下版本受到影响：
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 8.16.0 ~ 8.16.1 -
curl curl 0b091328773c64e23f5c4739da74527093c6a5ab ~ 849317ff5c5a5e13f50ec3d001e46ddffa77d8a4 -
curl curl 8.20.0 -

II. Public POCs for CVE-2026-11586

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III. Intelligence Information for CVE-2026-11586

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Vendor Advisories for CVE-2026-11586 (1)

Proof of Concept for CVE-2026-11586 (1)

Vendor Pages for CVE-2026-11586 (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-2026-11352 QUIC zero-length UDP datagrams busy-loop
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-770

V. Comments for CVE-2026-11586

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