CVE-2026-63343
Authenticated image symlink allows host file read/overwrite as root via metadata API
Is CVE-2026-63343 being exploited?
Not confirmed. CVE-2026-63343 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-63343?
CVE-2026-63343 is rated Critical with a CVSS score of 9.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-63343?
Yes. A fix has been recorded for CVE-2026-63343. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-63343 affect?
CVE-2026-63343 affects Incus < 7.3.0, Incus instance metadata API, Linux hosts running Incus, Container/VM images handled by Incus. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-63343?
Upgrade Incus to >=7.3.0, block untrusted images, audit hosts and restore compromised files
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker using a malicious image can read or overwrite any host file as root via the instance metadata API.
Immediate action required
- affected< 7.3.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.