CVE-2026-63297Network attack vector

Host escape via pre-merge project restriction check

Published Aug 12, 2026 · Updated Aug 12, 2026

Authorization bypass in Canonical LXD 5.0.0 through 5.0.7 and 5.21.0 through 5.21.5 allows remote authenticated users to escape project restrictions. AllowInstanceCreation checks the target project before createFromCopy merges source settings, so privileged and raw configuration keys evade validation. Exploitation requires permission to view a dangerous source instance and create an instance in the restricted project, after which starting the copied container grants host access.

CVSS severity9.9
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Canonical LXD 5.0.0 through 5.0.7 and 5.21.0 through 5.21.5 allows remote authenticated users to escape project restrictions. AllowInstanceCreation checks the target project before createFromCopy merges source settings, so privileged and raw configuration keys evade validation. Exploitation requires permission to view a dangerous source instance and create an instance in the restricted project, after which starting the copied container grants host access.

The record

CVE
CVE-2026-63297
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
Canonical
Product
LXD
Classifications
CWE-367, CWE-863, T1611
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0.0 <5.0.8
  2. Affected versionversion=5.21.0 <5.21.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Canonical · LXDversion=5.0.0 <5.0.8; version=5.21.0 <5.21.6

Published CVSS scores

9.9CanonicalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-863Incorrect Authorization
T1611Escape to Host

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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