Vulnerability · Published Jul 29, 2026 · Assigned by GitHub_M
CVE-2026-52791fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)
Low 2.0
In plain English
A low-severity security flaw in fuse-overlayfs from containers. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).
Severity (CVSS 4.0)2.0Low
Exploit odds (30 days)0.1%top 96.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | fuse-overlayfs | no fix listed | DEBIAN-CVE-2026-52791 |
| Debian:13 | fuse-overlayfs | no fix listed | DEBIAN-CVE-2026-52791 |
| Debian:14 | fuse-overlayfs | no fix listed | DEBIAN-CVE-2026-52791 |
| Ubuntu:22.04:LTS | fuse-overlayfs | no fix listed | UBUNTU-CVE-2026-52791 |
| Ubuntu:24.04:LTS | fuse-overlayfs | no fix listed | UBUNTU-CVE-2026-52791 |
| Ubuntu:26.04:LTS | fuse-overlayfs | no fix listed | UBUNTU-CVE-2026-52791 |
| Ubuntu:26.10 | fuse-overlayfs | no fix listed | UBUNTU-CVE-2026-52791 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| containers | fuse-overlayfs | < 1.17 |
Weakness: CWE-266 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N