Path traversal in LXD - CVE-2026-48769
Published: June 29, 2026
Vulnerability identifier: #VU135804
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-48769
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Containers
Affected software:
LXD
LXD
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to path traversal in image download handling for source.type=url when processing a crafted Incus-Image-Hash header from an image server. A remote user can return a crafted header value to write arbitrary files and execute arbitrary code.
The file is created and populated before SHA-256 validation occurs, and a slow or held response can extend the arbitrary-write window.
How to mitigate CVE-2026-48769
Install security update from vendor's website.