CVE-2026-63294 json
Root RCE via image backup.yaml symlink
published 2026-08-12 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-57538
- cvss
- 9.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
A link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of crafted image or backup archives, LXD fails to properly validate and confine the backup.yaml file when it exists as a symbolic link. An attacker can exploit this flaw by providing a malicious archive with a symlinked backup.yaml file, causing LXD to process unconfined configuration metadata and execute arbitrary commands with root privileges.
Patch / fix
- Canonical LXD 4.0.12, 5.0.8, 5.21.6, 6.10
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected products
- Canonical LXD
Classification
- Weakness
-
- CWE-59 Improper Link Resolution Before File Access
References
-
github.com
/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m
vdb-entry, vendor-advisory, exploit, third-party-advisory, mitigation
Sources
- CVE List CVE-2026-63294
- NVD CVE-2026-63294
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.