9.9

CVE-2026-85526: canonical lxd Path Traversal

CVSS: 9.9v3.1CriticalDeferred
AliasesUBUNTU-CVE-2026-85526DEBIAN-CVE-2026-85526
Published 28-09-2026Last modified 29-09-2026
Open JSON

Vulnerability summary

CVE-2026-85526 is a critical (CVSS 9.9) Path Traversal vulnerability in canonical lxd. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 42.7% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.9/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.52%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:11983-1

Timeline

  1. 28-09-2026
    PublishedVulnerability first disclosed.
  2. 29-09-2026
    Last modifiedVulnerability information updated.

Description

Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

29-09-202619-10-2026
EPSS score
0.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • incus< 6.0.4-2+deb13u1 | < 7.0.1-5
  • lxdAll versions (No fix recorded)
Ubuntu2 products
  • incusAll versions (No fix recorded)
  • lxdAll versions (No fix recorded)
Canonical1 product
  • lxd≥ 4.0.0, < 4.0.14 | ≥ 5.0.0, < 5.0.10 | ≥ 5.21.0, < 5.21.8 | ≥ 6.0, < 6.10

3 vendors · 5 products

References

9 links