CVE-2026-27211
Arbitrary host file exfiltration via QCOW2 header in Cloud Hypervisor (v34.0–50.0)
Is CVE-2026-27211 being exploited?
Not confirmed. CVE-2026-27211 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 0.50% probability of exploitation in the next 30 days.
How severe is CVE-2026-27211?
CVE-2026-27211 is rated Critical with a CVSS score of 9.1. 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-2026-27211?
Yes. A fix has been recorded for CVE-2026-27211. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27211 affect?
CVE-2026-27211 affects Cloud Hypervisor (versions 34.0-50.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27211?
Upgrade to 50.1; enforce trusted images and landlock sandbox
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Guest can exfiltrate host files by a crafted QCOW2 header; requires writable/untrusted image; single VM can trigger on boot/disk scan
Patch when possible
- affected>= 34.0 and < 50.1
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.