5.8

CVE-2026-87798: canonical lxd Link Following

CVSS: 5.8v3.1MediumDeferred
AliasesUBUNTU-CVE-2026-87798DEBIAN-CVE-2026-87798
Published 28-09-2026Last modified 28-09-2026
Open JSON

Vulnerability summary

CVE-2026-87798 is a medium (CVSS 5.8) Link Following vulnerability in canonical lxd. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 7.9% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

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

Description

Improper link resolution in the recursive file pull feature of the LXD CLI client in Canonical LXD versions 4.0.2 up to 6.9 (fixed in 4.0.14, 5.0.10 and 5.21.8) on Linux allows an attacker with root access inside a virtual machine to write attacker-controlled files or directory trees to arbitrary paths on the client host, with the operator's privileges. The attacker does this by using a modified lxd-agent that returns inconsistent SFTP directory listings and Lstat results.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

29-09-202619-10-2026
EPSS score
0.19%

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

Canonical1 product
  • lxd≥ 4.0.2, < 4.0.14 | ≥ 5.0.0, < 5.0.10 | ≥ 5.21.0, < 5.21.8 | ≥ 6.0, < 6.9
Debian1 product
  • lxdAll versions (No fix recorded)
Ubuntu1 product
  • lxdAll versions (No fix recorded)

3 vendors · 3 products

References

4 links