CVE-2026-3784

MEDIUM EPSS 21.8%
Published Mar 11, 20263mo ago · Modified Jun 17, 20261w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Mar 11, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
6.5
Exploitability
3.9
Impact
2.5
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
21.8% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-305

Affected Products 1

VendorProductVersionRange
haxxcurl*≥7.7  –  <8.18.0

References 5

  • openwall.com http://www.openwall.com/lists/oss-security/2026/03/11/3
    Mailing ListThird Party Advisory
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-253495.html
  • curl.se https://curl.se/docs/CVE-2026-3784.html
    PatchVendor Advisory
  • curl.se https://curl.se/docs/CVE-2026-3784.json
    Vendor Advisory
  • hackerone.com https://hackerone.com/reports/3584903
    ExploitIssue TrackingThird Party Advisory

Remediation

  • curl.se https://curl.se/docs/CVE-2026-3784.html
    PatchVendor Advisory