CVE-2025-47711

Name	CVE-2025-47711
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.
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	1105227

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			1105227

Notes

[bookworm] - nbdkit <no-dsa> (Minor issue)
[bullseye] - nbdkit <postponed> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2365687
Fixed by: https://gitlab.com/nbdkit/nbdkit/-/commit/e6f96bd1b77c0cc927ce6aeff650b52238304f39 (v1.43.7)
Fixed by: https://gitlab.com/nbdkit/nbdkit/-/commit/c3c1950867ea8d9c2108ff066ed9e78dde3cfc3f (v1.42.3)