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CVE Record

CVE-2026-24708: An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and 32 before 32.1.1.

An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and 32 before 32.1.1. By writing a malicious QCOW header to a root or ephemeral disk and then triggering a resize, a user may convince Nova's Flat image backend to call qemu-img without a format restriction, resulting in an unsafe image resize operation that could destroy data on the host system. Only compute nodes using the Flat image backend (usually configured with use_cow_images=False) are affected.

HighCVSS 8.2Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This Nova flaw can let an authenticated cloud user trigger an unsafe disk resize path that may destroy data on an OpenStack compute host. The risk is concentrated in deployments using Nova's Flat image backend, commonly with use_cow_images=False, and affected Nova releases before the listed fixed versions.

Executive priority

Treat this as a high-priority cloud infrastructure issue if your OpenStack estate uses Nova Flat image backend. The business concern is possible host-level data loss from a tenant-accessible path, not broad internet unauthenticated compromise.

Technical view

Nova's Flat image backend can invoke qemu-img for resize without enforcing an image format restriction after crafted QCOW metadata is placed on a root or ephemeral disk. The reported impact is host data destruction. Affected versions are before 30.2.2, 31.2.1, and 32.1.1.

Likely exposure

Exposure is likely limited to OpenStack Nova compute nodes using the Flat image backend, usually configured with use_cow_images=False. Other image backends are not identified as affected in the source bundle.

Exploitation context

The CVSS vector indicates low privileges are required, user interaction is not required, and attack complexity is high. The bundle does not show CISA KEV listing or cited evidence of active exploitation.

Researcher notes

Key scoping details are backend-specific exposure, fixed upstream versions, and high attack complexity. The provided evidence does not establish active exploitation. Validate backend configuration before declaring broad OpenStack exposure.

Mitigation direction

  • Upgrade Nova to 30.2.2, 31.2.1, 32.1.1, or later as applicable.
  • Review OpenStack, Debian, and Red Hat advisories for distribution-specific fixes.
  • Prioritize compute nodes using the Flat image backend or use_cow_images=False.
  • Check vendor guidance before applying compensating controls not named in advisories.

Validation and detection

  • Inventory Nova versions across controllers and compute nodes.
  • Identify compute nodes configured for the Flat image backend.
  • Confirm whether use_cow_images=False is present in Nova configuration.
  • Review recent resize activity on exposed compute nodes for abnormal failures or host data impact.
  • Verify package updates against Debian or Red Hat advisory status where applicable.
Prepared
Confidence
high
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-669: Exact CWE lookup

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cwe · medium confidence lookup

CWE-73: File access and web shell behavior lookup

File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-24708 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.2 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
3ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.2CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H1.85.8mitre
7.1CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H1.85.2redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.2High
CVSS 3.1 vector shape for CVE-2026-24708Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Reported to Red Hat.

  2. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  3. ADP timelineredhat-SADP

    Made public.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container
redhat-SADPopenstack-nova-compute: Arbitrary Host File Overwrite via Unconstrained qemu-img Format Handling in OpenStack Nova
other:Red Hat severity ratingcvssV3_1
  • 2026-01-16T06:29:23.249Z: Reported to Red Hat.
  • 2026-02-17T15:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
OpenStackNova0, 31.0.0, 32.0.0unaffected
Weakness

CWE details

CWE-669CWE-73

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-669 · source CWE mapping

Incorrect Resource Transfer Between Spheres

Incorrect Resource Transfer Between Spheres represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-73 · source CWE mapping

External Control of File Name or Path

External Control of File Name or Path represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs