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CVE-2026-3784— wrong proxy connection reuse with credentials

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cURL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存在安全漏洞，该漏洞源于错误地重用现有HTTP代理连接，可能导致使用不同凭据的新请求被错误处理。

AI Predicted 4.3 Difficulty: Easy EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 195

VendorProduct Version RangeStatus
curl curl 7.7.0< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.19.0 affected
a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4< 5f13a7645e565c5c1a06f3ef86e97afb856fb364 affected
8.18.0 affected
8.17.0 affected
8.16.0 affected
8.15.0 affected
… +187 more rows
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I. Basic Information for CVE-2026-3784

Vulnerability Information
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Vulnerability Title
wrong proxy connection reuse with credentials
Source: CVE Program / CVE List V5
Vulnerability Description
curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用基本弱点进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
curl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是cURL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存在安全漏洞，该漏洞源于错误地重用现有HTTP代理连接，可能导致使用不同凭据的新请求被错误处理。
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 7.7.0 ~ 8.14.2 -
curl curl a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4 ~ 5f13a7645e565c5c1a06f3ef86e97afb856fb364 -
curl curl 8.18.0 -

II. Public POCs for CVE-2026-3784

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III. Intelligence Information for CVE-2026-3784

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Vendor Advisories for CVE-2026-3784 (2)

Same Patch Batch · curl · 2026-03-11 · 4 CVEs total

CVE-2026-3805 use after free in SMB connection reuse
CVE-2026-3783 token leak with redirect and netrc
CVE-2026-1965 bad reuse of HTTP Negotiate connection

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-305

V. Comments for CVE-2026-3784

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