CVE-2025-47712: A flaw exists in the nbdkit "blocksize" filter that can be triggered by a specific type of client request

Routine

MEDIUM 6.5MITIGATE

CVE-2025-47712 is a medium-severity flaw (CVSS 6.5) affecting nbdkit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw exists in the nbdkit "blocksize" filter that can be triggered by a specific type of client request. When a client requests block status information for a very large data range, exceeding a certain limit, it causes an internal error in the nbdkit, leading to a denial of service.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-190
Published	2025-06-09
Last modified	2026-06-30

Publisher (CNA): Red Hat, Inc. · Vendor: nbdkit project

Last updated 2026-06-30 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-06-09 06:15 UTCPublished CVE record published
2026-06-30 05:17 UTCUpdated Record last modified

nbdkit project nbdkit MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nbdkit || rpm -q nbdkit || nbdkit --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-47712?

nbdkit: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-47712 being exploited?

CVE-2025-47712 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-47712 affect?

CVE-2025-47712 affects nbdkit. Severity is medium (CVSS 6.5). A flaw exists in the nbdkit "blocksize" filter that can be triggered by a specific type of client request. When a client requests block status information for a very large data range, exceeding a certain limit, it causes an internal error i

How urgent is CVE-2025-47712?

Priority 33/100. No elevated risk signals yet.

Related CVEs

CVE-2025-47711 MEDIUM 6.5 MITIGATE MITIGATE There's a flaw in the nbdkit server when handling responses from its plugins regarding the status of data bloc

References

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