CVE-2026-3784

Publication date 11 March 2026

Last updated 11 March 2026

Description

From the Ubuntu Security Team

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.

Why is this CVE low priority?

Upstream defined it as low

Learn more about Ubuntu priority

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	25.10 questing	Fixed 8.14.1-2ubuntu1.2
	24.04 LTS noble	Fixed 8.5.0-2ubuntu10.8
	22.04 LTS jammy	Fixed 7.81.0-1ubuntu1.23
	20.04 LTS focal	Vulnerable
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Vulnerable

How can I get the fixes?
What do statuses mean?
Patch details

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
curl	Upstream: 5f13a76

References

MITRE
NVD
Launchpad
Debian

Related Ubuntu Security Notices (USN)

USN-8084-1
curl vulnerabilities
11 March 2026

Other references

https://www.cve.org/CVERecord?id=CVE-2026-3784
https://curl.se/docs/CVE-2026-3784.html