CVE-2025-47711: nbdkit — Fix

Description

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.

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CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-193 CWE-193

Affected Products

Vendor	Product	Versions
nbdkit_project	nbdkit	All
redhat	enterprise_linux	All
redhat	enterprise_linux	All
redhat	enterprise_linux	All
redhat	enterprise_linux	All
redhat	enterprise_linux_advanced_virtualization	All

References

Advisories & Patches

https://access.redhat.com/security/cve/CVE-2025-47711

Other References

https://bugzilla.redhat.com/show_bug.cgi?id=2365687

Frequently Asked Questions

What is CVE-2025-47711? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-47711? +

CVE-2025-47711 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-47711? +

CVE-2025-47711 affects products from nbdkit_project, redhat, specifically: enterprise_linux, enterprise_linux_advanced_virtualization, nbdkit. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-47711? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-47711