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.
CVSS Score
6.5
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 7.7, < 8.18.0 |
Related Weaknesses (CWE)
References
- https://curl.se/docs/CVE-2026-3784.htmlPatchVendor Advisory
- https://curl.se/docs/CVE-2026-3784.jsonVendor Advisory
- https://hackerone.com/reports/3584903ExploitIssue TrackingThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/11/3Mailing ListThird Party Advisory
FAQ
What is CVE-2026-3784?
CVE-2026-3784 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 s...
How severe is CVE-2026-3784?
CVE-2026-3784 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3784?
Check the references section above for vendor advisories and patch information. Affected products include: Haxx Curl.