CVE-2026-63298Public exploitNetwork attack vectorHinoki check available

Host-root code execution via newline directive injection

Published Aug 12, 2026 · Updated Aug 12, 2026

Configuration injection in affected Canonical LXD releases allows remote authenticated users to execute arbitrary code as host root. The nvidia.driver.capabilities validator accepts newline-bearing input, which is formatted without escaping into generated lxc.conf content as a new lxc.hook.pre-start directive. Instance-configuration permission is required, and execution occurs when LXC parses the generated configuration during container startup.

CVSS severity8.7
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Configuration injection in affected Canonical LXD releases allows remote authenticated users to execute arbitrary code as host root. The nvidia.driver.capabilities validator accepts newline-bearing input, which is formatted without escaping into generated lxc.conf content as a new lxc.hook.pre-start directive. Instance-configuration permission is required, and execution occurs when LXC parses the generated configuration during container startup.

The record

CVE
CVE-2026-63298
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
Canonical
Product
LXD
Classifications
CWE-78, CAPEC-81, CAPEC-233, T1059.004, T1068
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=4.0.0 <4.0.12
  2. Affected versionversion=5.0.0 <5.0.8
  3. Affected versionversion=5.21.0 <5.21.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Canonical · LXDversion=4.0.0 <4.0.12; version=5.0.0 <5.0.8; version=5.21.0 <5.21.6

Published CVSS scores

8.7CanonicalCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CAPEC-81Input Data Manipulation
CAPEC-233Privilege Escalation
T1059.004Command and Scripting Interpreter: Unix Shell
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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