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CVE-2026-87799Arbitrary file write on LXD host via symlink in migration stream

Description

Improper link resolution in the migration receive path in Canonical LXD versions 4.0 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client that can create instances or custom storage volumes in a project, or a malicious migration source server, to write attacker-controlled files to arbitrary paths on the target host as root, leading to full host compromise. The attacker does this with a crafted rsync or btrfs send stream that plants a symlink in the transferred volume, such as rootfs or root.img, and then writes through it.

Timeline

  1. ID reserved

    By canonical

  2. · 19 days later

    Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-87799, by who scored it
Scored byCVSSScoreVector
canonicalCNA (assigner)3.1Critical9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVDNVD · Deferred3.1Critical9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.41% · top 64% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.9.

Affected products

  • Canonical · LXD

    • affected 4.0.0 – < 4.0.14
    • affected 5.0.0 – < 5.0.10
    • affected 5.21.0 – < 5.21.8
    • affected 6.0 – < 6.10

What to do

Solution: Upgrade to LXD versions 4.0.14, 5.0.10, 5.21.8, 6.10 or later.

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .