CVE-2026-52791

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.

• fuse-overlayfs (bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1143058) https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h Fixed by: https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f (v1.17)