CVE-2026-3784

Publication date 11 March 2026

Last updated 13 March 2026

Ubuntu priority

Cvss 3 Severity Score

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	Not affected
	14.04 LTS trusty	Not affected

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

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

USN-8084-1
curl vulnerabilities
11 March 2026