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CVE-2025-47711

Nbdkit: nbdkit-server: off-by-one error when processing block status may lead to a denial of service

Published: Jun 9, 2025Updated: Jan 8, 2026 Sources: CVE List NVD BDUCWE-193
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 78.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-193

Affected Products

nbdkitnbdkit project
Library
OSS Libraries / generic-library
enterprise linuxredhat
On-premOS
Operating Systems / linux-distro
enterprise linux advanced virtualizationredhat
On-prem
Operating Systems / linux-distro
Red Hat Enterprise Linux 10Red Hat
On-premOS
Operating Systems / linux-distro
nbdkit projectoss-projectOSS Libraries
redhatcommercialUSOperating Systemsaka red hat
red hatcommercialUSOperating Systemsaka red hat
and 7 more affected products View all →

Exploitability

Official Patch Available

References

https://access.redhat.com/security/cve/CVE-2025-47711
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2365687
bugzilla.redhat.com
https://access.redhat.com/security/cve/CVE-2025-47711
access.redhat.com
and 7 more references View all →

Timeline

Published
Jun 9, 2025
Last Updated
Jan 8, 2026

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