CVE-2026-52791

Name	CVE-2026-52791
Description	fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1143058

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
fuse-overlayfs (PTS)	bullseye	1.4.0-1	vulnerable
	bookworm	1.10-1	vulnerable
	forky, sid, trixie	1.14-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
fuse-overlayfs	source	(unstable)	(unfixed)			1143058

Notes

[trixie] - fuse-overlayfs <no-dsa> (Minor issue)
https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h
Fixed by: https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f (v1.17)