CVE-2026-86334 CLI Path Traversal via Content-Disposition in LXD Image Export/Copy
A remote attacker can overwrite local files and execute code on LXD clients via a malicious Content-Disposition header during image export or copy operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-86334?
CVE-2026-86334 is a medium-severity path traversal vulnerability in Canonical LXD, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Path traversal in the CLI client image export and copy functionality in Canonical LXD from 4.0.2 before 4.0.14, 5.0.10, 5.21.8, and 6.10 on all platforms allows a remote malicious or machine-in-the-middle image server to overwrite arbitrary local files and execute code on the client system via a crafted Content-Disposition header filename parameter during unified image export or copy operations into a local directory target.
Weakness: CWE-22
Which versions are affected by CVE-2026-86334?
How do I fix CVE-2026-86334?
No fix has been published for CVE-2026-86334 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-86334 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86334 exists.
Sources
Also known as DEBIAN-CVE-2026-86334, GHSA-g4cm-f533-78hq, UBUNTU-CVE-2026-86334.