CVE-2026-52791— fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)
Quick assessment
Affected
containers fuse-overlayfs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Containers fuse-overlayfs是Containers组织开源的一款文件系统叠加软件。 Containers fuse-overlayfs 1.17之前版本存在权限许可和访问控制问题漏洞，该漏洞源于main.c中open(O_TRUNC)和truncate处理时保留了SUID和SGID模式位，允许低权限进程使上层文件具有模式4777。
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1548.002 · Bypass User Account ControlAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| containers | fuse-overlayfs | < 1.17 |
affected |
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I. Basic Information for CVE-2026-52791
Vulnerability Information
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Vulnerability Title
fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)
Source: CVE Program / CVE List V5
Vulnerability 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 Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Containers fuse-overlayfs 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Containers fuse-overlayfs是Containers组织开源的一款文件系统叠加软件。 Containers fuse-overlayfs 1.17之前版本存在权限许可和访问控制问题漏洞，该漏洞源于main.c中open(O_TRUNC)和truncate处理时保留了SUID和SGID模式位，允许低权限进程使上层文件具有模式4777。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| containers | fuse-overlayfs | < 1.17 | - |
|
II. Public POCs for CVE-2026-52791
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-52791 (2)
-
🔗 Release v1.17 · containers/fuse-overlayfs · GitHub x_refsource_MISC
-
Vendor Advisories for CVE-2026-52791 (1)
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V. Comments for CVE-2026-52791
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