---
id: CVE-2025-47711
title: >-
  There's a flaw in the nbdkit server when handling responses from its plugins
  regarding the status of data blocks
summary: >-
  There's a flaw in the nbdkit server when handling responses from its plugins
  regarding the status of data blocks. If a client makes a specific request for
  a very large data range, and a plugin responds with an even larger single
  block, t…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-193
vendor: nbdkit_project
product: nbdkit
affected:
  - nbdkit
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
  - enterprise_linux_advanced_virtualization = 8.0
published: '2025-06-09'
updated: '2026-06-26'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-47711'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2025-47711'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2365687'
    label: secalert@redhat.com
  - url: >-
      https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/67E7AASHHADIY7VAD3FFW2I67LTWVWYF/
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00453
epssPercentile: 0.3664
ingestedAt: '2026-06-26T16:43:13.605Z'
---

## Overview

There's a flaw in the nbdkit server when handling responses from its plugins regarding the status of data blocks. If a client makes a specific request for a very large data range, and a plugin responds with an even larger single block, the nbdkit server can encounter a critical internal error, leading to a denial-of-service.

## Affected

- `nbdkit`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`
- `enterprise_linux_advanced_virtualization = 8.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.