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CVE-2025-47712

Nbd: nbdkit: integer overflow triggers an assertion resulting in denial of service

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.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Nbdkit Project Redhat
Products
Nbdkit Advanced Virtualization Enterprise Linux and 2 more
CVE-2025-47711

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

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 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Nbdkit Project Redhat
Products
Nbdkit Advanced Virtualization Enterprise Linux and 2 more
CVE-2021-3716

nbdkit: NBD_OPT_STRUCTURED_REPLY injection on STARTTLS

A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Vendors
Nbdkit Project Redhat
Products
Nbdkit Advanced Virtualization Enterprise Linux
CVE-2019-14851

nbdkit: assertion failure by issuing commands in the wrong order

A denial of service vulnerability was discovered in nbdkit. A client issuing a certain sequence of commands could possibly trigger an assertion failure, causing nbdkit to exit. This issue only affected nbdkit versions 1.12.7, 1.14.1, and 1.15.1.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Nbdkit Project
Products
Nbdkit
CVE-2019-14850

nbdkit: denial of service due to premature opening of back-end connection

A denial of service vulnerability was discovered in nbdkit 1.12.7, 1.14.1 and 1.15.1. An attacker could connect to the nbdkit service and cause it to perform a large amount of work in initializing backend plugins, by simply opening a connection to the service. This vulnerability could cause resource consumption and degradation of service in nbdkit, depending on the plugins configured on the server-side.

CVSS 3.1 · 3.7 Low EPSS 1.6% KEV · Not listed
Vendors
Nbdkit Project Redhat
Products
Nbdkit Enterprise Linux Enterprise Linux Server and 1 more