Path traversal in LXD - CVE-2026-48769
Published: June 29, 2026
Vulnerability identifier: #VU135804
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-48769
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
LXD
Debian Linux
lxd (Debian package)
Debian Linux
lxd (Debian package)
How to mitigate CVE-2026-48769
Install security update from vendor's website.
LXD - addressed in versions 4.0.11, 5.0.7, 5.21.5, 6.9
lxd (Debian package) - update to 5.0.2+git20231211.1364ae4-9+deb13u7
lxd (Debian package) - update to 5.0.2+git20231211.1364ae4-9+deb13u7