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CVE-2026-11564— Native CA trust persist

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存在加密问题漏洞，该漏洞源于连接池中先前使用的连接在后续传输中可被重用，且当应用程序切换处理句柄的自定义CA材料后，仍继续信任原生平台存储。以下版本受到影响：8.20.0版本、8.19.0版本、8.18.0版本和8.17.0版本。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.61% · P49

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 6

VendorProduct Version RangeStatus
curl curl 8.17.0< 8.20.1 affected
eefd03c572996e5de4dec4fe295ad6f103e0eefc< d69bfad3fa3daf5e72331f6870667607828d5891 affected
8.20.0 affected
8.19.0 affected
8.18.0 affected
8.17.0 affected
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I. Basic Information for CVE-2026-11564

Vulnerability Information
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Vulnerability Title
Native CA trust persist
Source: CVE Program / CVE List V5
Vulnerability Description
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
curl 加密问题漏洞
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存在加密问题漏洞，该漏洞源于连接池中先前使用的连接在后续传输中可被重用，且当应用程序切换处理句柄的自定义CA材料后，仍继续信任原生平台存储。以下版本受到影响：8.20.0版本、8.19.0版本、8.18.0版本和8.17.0版本。
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 8.17.0 ~ 8.20.1 -
curl curl eefd03c572996e5de4dec4fe295ad6f103e0eefc ~ d69bfad3fa3daf5e72331f6870667607828d5891 -
curl curl 8.20.0 -

II. Public POCs for CVE-2026-11564

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III. Intelligence Information for CVE-2026-11564

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Vendor Advisories for CVE-2026-11564 (2)

Other References for CVE-2026-11564 (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-2026-11856 cross-origin Digest auth state leak
CVE-2026-11586 WS Auto-PONG memory exhaustion

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-295