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.

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Weakness Type (CWE)

CWE-266 CWE-266

References

Other References

https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f https://github.com/containers/fuse-overlayfs/releases/tag/v1.17 https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-52791? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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