CVE-2025-47712

Name	CVE-2025-47712
Description	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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1105228

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
nbdkit (PTS)	bullseye	1.24.1-2	vulnerable
	bookworm	1.32.5-1	vulnerable
	sid, trixie	1.42.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
nbdkit	source	(unstable)	1.42.3-1			1105228

Notes

[bookworm] - nbdkit <no-dsa> (Minor issue)
[bullseye] - nbdkit <postponed> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2365724
Fixed by: https://gitlab.com/nbdkit/nbdkit/-/commit/a486f88d1eea653ea88b0bf8804c4825dab25ec7 (v1.43.7)
Fixed by: https://gitlab.com/nbdkit/nbdkit/-/commit/c3ed72811aca5684490b198737b2f0b921741547 (v1.42.3)