Low severity · published Jul 29, 2026
CVE-2026-52791
fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)
2.0
CVSS
0.1%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FU
fuse-overlayfs · containers
< 1.17 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-52791
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-52791
github.com
https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f
github.com
https://github.com/containers/fuse-overlayfs/releases/tag/v1.17
github.com
https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h