CVE-2026-52791: CWE-266: Incorrect Privilege Assignment in containers fuse-overlayfs
fuse-overlayfs versions prior to 1.17 contain a vulnerability where SUID and SGID bits are incorrectly preserved during file truncation operations, allowing a low-privileged process to create files with mode 4777. This issue is fixed in version 1.17. The vulnerability has a low severity rating and a CVSS score of 2.0.
AI Analysis
Technical Summary
The vulnerability in fuse-overlayfs (CVE-2026-52791) involves incorrect privilege assignment due to preservation of SUID and SGID mode bits during open(O_TRUNC) and truncate handling on copied-up files in versions before 1.17. This allows a low-privileged process to leave an upper-layer file with mode 4777, potentially escalating privileges improperly. The issue is resolved in fuse-overlayfs version 1.17.
Potential Impact
A low-privileged process can create or modify files in the overlay upper layer with elevated permission bits (SUID/SGID set), which may lead to unintended privilege escalation or unauthorized access. However, the overall severity is low, and no known exploits are reported in the wild.
Mitigation Recommendations
Upgrade fuse-overlayfs to version 1.17 or later, where this issue is fixed. No other mitigation or temporary workaround is indicated.
CVE-2026-52791: CWE-266: Incorrect Privilege Assignment in containers fuse-overlayfs
Description
fuse-overlayfs versions prior to 1.17 contain a vulnerability where SUID and SGID bits are incorrectly preserved during file truncation operations, allowing a low-privileged process to create files with mode 4777. This issue is fixed in version 1.17. The vulnerability has a low severity rating and a CVSS score of 2.0.
CVSS v4.0
Score 2.0low
Affected software
pkg:github/containers/fuse-overlayfsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in fuse-overlayfs (CVE-2026-52791) involves incorrect privilege assignment due to preservation of SUID and SGID mode bits during open(O_TRUNC) and truncate handling on copied-up files in versions before 1.17. This allows a low-privileged process to leave an upper-layer file with mode 4777, potentially escalating privileges improperly. The issue is resolved in fuse-overlayfs version 1.17.
Potential Impact
A low-privileged process can create or modify files in the overlay upper layer with elevated permission bits (SUID/SGID set), which may lead to unintended privilege escalation or unauthorized access. However, the overall severity is low, and no known exploits are reported in the wild.
Mitigation Recommendations
Upgrade fuse-overlayfs to version 1.17 or later, where this issue is fixed. No other mitigation or temporary workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-08T18:02:19.731Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6a417a9c2644c7f8dd21da
Added to database: 07/29/2026, 18:07:54 UTC
Last enriched: 07/29/2026, 18:22:44 UTC
Last updated: 07/29/2026, 18:58:20 UTC
Views: 4
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