CVE-2026-27211

CRITICALNVD 10.010.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.6% (47th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-7729 (ENISA EUVD)Source: ENISA EUVD

10.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 10.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. Versions 34.0 through 50.0 arevulnerable to arbitrary host file exfiltration (constrained by process privileges) when using virtio-block devices backed by raw images. A malicious guest can overwrite its disk header with a crafted QCOW2 structure pointing to a sensitive host path. Upon the next VM boot or disk scan, the image format auto-detection parses this header and serves the host file's contents to the guest. Guest-initiated VM reboots are sufficient to trigger a disk scan and do not cause the Cloud Hypervisor process to exit. Therefore, a single VM can perform this attack without needing interaction from the management stack. Successful exploitation requires the backing image to be either writable by the guest or sourced from an untrusted origin. Deployments utilizing only trusted, read-only images are not affected. This issue has been fixed in version 50.1. To workaround, enable land lock sandboxing and restrict process privileges and access.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
45
EG Risk 45/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity100% × 45%
Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.

EG Severity
10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 21, 2026

Last Modified

June 17, 2026

Advisory Details (7)

Auto-updated Oct 27, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Host File Exfiltration via QCOW Backing File Abuse · Advisory · cloud-hypervisor/cloud-hypervisor · GitHub

https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-jmr4-g2hv-mjj6
GitHub release Patch Available

v51.0

Patch available: cloud-hypervisor/cloud-hypervisor v51.0

https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.0
GitHub release Patch Available

v50.1

Patch available: cloud-hypervisor/cloud-hypervisor v50.1

https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v50.1
GitHub commit

commit cb495959a8be (cloud-hypervisor/cloud-hypervisor)

Fix landed in cloud-hypervisor/cloud-hypervisor commit cb495959a8be — awaiting tagged release

https://github.com/cloud-hypervisor/cloud-hypervisor/commit/cb495959a8bea1b56e8fc82d15ba527a0e7fcf3c
GitHub commit

commit a63315df54e0 (cloud-hypervisor/cloud-hypervisor)

Fix landed in cloud-hypervisor/cloud-hypervisor commit a63315df54e0 — awaiting tagged release

https://github.com/cloud-hypervisor/cloud-hypervisor/commit/a63315df54e06f6ec867f17b63076c266e2d8648
GitHub commit

commit 509832298b68 (cloud-hypervisor/cloud-hypervisor)

Fix landed in cloud-hypervisor/cloud-hypervisor commit 509832298b68 — awaiting tagged release

https://github.com/cloud-hypervisor/cloud-hypervisor/commit/509832298b6865365b00bda88722e76e41ce7f41
GitHub commit

commit 081a6ebb5184 (cloud-hypervisor/cloud-hypervisor)

Fix landed in cloud-hypervisor/cloud-hypervisor commit 081a6ebb5184 — awaiting tagged release

https://github.com/cloud-hypervisor/cloud-hypervisor/commit/081a6ebb5184228ff348601502258f3f72bd8b43

Vendor Advisories for CVE-2026-27211(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 70× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 152 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 55 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-11-01 15:14 UTCVendor advisory
  3. 2026-10-31 16:45 UTCEG score recompute
  4. 2026-10-31 16:45 UTCVendor advisory
  5. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-10-30 17:50 UTCEG score recompute
  7. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-10-29 19:22 UTCEG score recompute
  9. 2026-10-29 19:22 UTCVendor advisory
  10. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  11. 2026-10-28 20:53 UTCEG score recompute
  12. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-10-27 22:25 UTCEG score recompute
  14. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-10-26 23:54 UTCEG score recompute
  16. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  17. 2026-10-25 21:50 UTCEG score recompute
  18. 2026-10-25 21:50 UTCVendor advisory
  19. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  20. 2026-10-25 14:39 UTCEG score recompute
  21. 2026-10-24 23:18 UTCEG score recompute
  22. 2026-10-24 23:18 UTCVendor advisory
  23. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-10-24 00:50 UTCEG score recompute
  25. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
Show 72 more
  1. 2026-10-23 02:21 UTCEG score recompute
  2. 2026-10-23 02:21 UTCVendor advisory
  3. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  4. 2026-10-22 03:52 UTCEG score recompute
  5. 2026-10-22 03:52 UTCVendor advisory
  6. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  7. 2026-10-21 05:21 UTCEG score recompute
  8. 2026-10-21 05:21 UTCVendor advisory
  9. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-10-20 06:50 UTCEG score recompute
  11. 2026-10-20 06:50 UTCVendor advisory
  12. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-10-19 08:19 UTCEG score recompute
  14. 2026-10-19 08:19 UTCVendor advisory
  15. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  16. 2026-10-18 09:49 UTCVendor advisory
  17. 2026-10-18 03:51 UTCEG score recompute
  18. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  19. 2026-10-17 06:24 UTCEG score recompute
  20. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  21. 2026-10-16 07:47 UTCEG score recompute
  22. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  23. 2026-10-15 06:47 UTCEG score recompute
  24. 2026-10-15 06:47 UTCVendor advisory
  25. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  26. 2026-10-14 02:31 UTCEG score recompute
  27. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  28. 2026-10-12 22:45 UTCEG score recompute
  29. 2026-10-12 22:45 UTCVendor advisory
  30. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  31. 2026-10-12 16:17 UTCEG score recompute
  32. 2026-10-12 08:53 UTCVendor advisory
  33. 2026-10-11 20:00 UTCEG score recompute
  34. 2026-10-11 17:13 UTCEG score recompute
  35. 2026-10-11 14:44 UTCEG score recompute
  36. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  37. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  38. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  39. 2026-10-09 14:58 UTCOSV refresh
  40. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  41. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  42. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  43. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  44. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  45. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  46. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  47. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  48. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  49. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  50. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  51. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  52. 2026-09-19 22:20 UTCOSV refresh
  53. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  54. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  55. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  56. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  57. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  58. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  59. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  60. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  61. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  62. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  63. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  64. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  65. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  66. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  67. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  68. 2026-09-01 01:34 UTCOSV refresh
  69. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  70. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  71. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  72. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile

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Frequently asked(5)

What is CVE-2026-27211?
CVE-2026-27211 is a critical-severity vulnerability; its CVE record was published on February 21, 2026. Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. Versions 34.0 through 50.0 arevulnerable to arbitrary host file exfiltration (constrained by process privileges) when using virtio-block devices backed by raw images. A malicious guest can overwrite its disk header with a crafted…
When was the CVE record for CVE-2026-27211 published?
The CVE record for CVE-2026-27211 was published on February 21, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-27211 actively exploited?
CVE-2026-27211 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-27211?
CVE-2026-27211 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-27211?
A fix for CVE-2026-27211 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-27211 are linked in the Vendor Advisories panel on this page.

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