CVE-2026-3784

Name: CVE-2026-3784
Creator: NVD / NIST
Published: 2026-03-11T11:16:00.437+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2026-3784 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.30%

21.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-305

Affected Software

Vendor	Product	Versions
Haxx	Curl	>= 7.7, < 8.18.0

References

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

Timeline

Published: Mar 11, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-3784?

How severe is CVE-2026-3784?

CVE-2026-3784 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3784?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3784?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST