Vulnerability Report

CVE-2026-3784

Title: curl HTTP Proxy Connection Reuse with Different Credentials

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-3784.

CWE Category NVD-CWE-noinfo

Published Date Mar 11, 2026

Modified Date Jun 02, 2026

Exploit Status Not Found

Score 6.5 CVSS v

Exploit Probability (EPSS)

0.03%

Vulnerability Summary

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.

Impacted Vendors

daniel_stenberg 1

haxx 1

Reference Links

https://curl.se/docs/CVE-2026-3784.html https://curl.se/docs/CVE-2026-3784.json https://hackerone.com/reports/3584903 http://www.openwall.com/lists/oss-security/2026/03/11/3

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns