CVE-2023-27534

Publication date 20 March 2023

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be wrongly replaced when used as a prefix in the first path element, in addition to its intended use as the first element to indicate a path relative to the user's home directory. Attackers can exploit this flaw to bypass filtering or execute arbitrary code by crafting a path like /~2/foo while accessing a server with a specific user.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	23.04 lunar	Fixed 7.88.1-6ubuntu2
	22.10 kinetic	Fixed 7.85.0-1ubuntu0.5
	22.04 LTS jammy	Fixed 7.81.0-1ubuntu1.10
	20.04 LTS focal	Fixed 7.68.0-1ubuntu2.18
	18.04 LTS bionic	Fixed 7.58.0-2ubuntu3.24
	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: 4e2b52b

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-5964-1
curl vulnerabilities
20 March 2023