CVE-2026-3784

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-3784
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.

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://curl.se/docs/CVE-2026-3784.html Patch Vendor Advisory
https://curl.se/docs/CVE-2026-3784.json Vendor Advisory
https://hackerone.com/reports/3584903 Exploit Issue Tracking Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/11/3 Mailing List Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-253495.html
Configurations

Configuration 1 (hide)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
History

02 Jun 2026, 14:16

Type Values Removed Values Added
References
  • () https://cert-portal.siemens.com/productcert/html/ssa-253495.html -
Summary
  • (es) curl reutilizaría erróneamente una conexión proxy HTTP existente haciendo CONNECT a un servidor, incluso si la nueva solicitud utiliza credenciales diferentes para el proxy HTTP. El comportamiento adecuado es crear o usar una conexión separada.

12 Mar 2026, 14:09

Type Values Removed Values Added
References () https://curl.se/docs/CVE-2026-3784.html - () https://curl.se/docs/CVE-2026-3784.html - Patch, Vendor Advisory
References () https://curl.se/docs/CVE-2026-3784.json - () https://curl.se/docs/CVE-2026-3784.json - Vendor Advisory
References () https://hackerone.com/reports/3584903 - () https://hackerone.com/reports/3584903 - Exploit, Issue Tracking, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2026/03/11/3 - () http://www.openwall.com/lists/oss-security/2026/03/11/3 - Mailing List, Third Party Advisory
CPE cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
First Time Haxx curl
Haxx

11 Mar 2026, 16:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 6.5
CWE CWE-305

11 Mar 2026, 11:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-11 11:16

Updated : 2026-06-02 14:16

NVD link : CVE-2026-3784

Mitre link : CVE-2026-3784

CVE.ORG link : CVE-2026-3784

JSON object : View

Products Affected

haxx

  • curl
CWE
CWE-305

Authentication Bypass by Primary Weakness