CVE-2025-15079

Publication date 6 January 2026

Last updated 3 March 2026

Ubuntu priority

Cvss 3 Severity Score

Description

When doing SSH-based transfers using either SCP or SFTP, and setting the known_hosts file, libcurl could still mistakenly accept connecting to hosts *not present* in the specified file if they were added as recognized in the libssh *global* known_hosts file.

Read the notes from the security team

Why is this CVE low priority?

This is rated as being low severity by Curl developers

Learn more about Ubuntu priority

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.04 LTS noble	Fixed 8.5.0-2ubuntu10.7
	22.04 LTS jammy	Fixed 7.81.0-1ubuntu1.22
	20.04 LTS focal	Fixed 7.68.0-1ubuntu2.25+esm2
	18.04 LTS bionic	Fixed 7.58.0-2ubuntu3.24+esm7
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

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Notes

mdeslaur

only affects curl built with the libssh, not libssh2 in plucky+, libssh2 is used for builds

Patch details

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

Package	Patch details
curl	Upstream: adca486

Severity score breakdown

Parameter	Value
Base score	5.3 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N