CVE-2026-93320: CWE-441: Unintended Proxy or Intermediary ('Confused Deputy') in moby BuildKit
Description
BuildKit may be tricked into performing file actions with special file inodes where regular files are expected. Special files may block operations or, on rootful workers, allow unintended host device access.
CVSS v4.0
Score 6.0medium
Affected software
moby
BuildKit
pkg:github/github.com/moby/buildkitRun 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
BuildKit in moby contains a CWE-441 (Confused Deputy) vulnerability where it may be tricked into performing file actions on special file inodes when it expects regular files. This can lead to blocking of file operations or, in environments where BuildKit runs with root privileges, unintended access to host devices. The vulnerability affects versions >=0 and <=0.33.0. The CVSS 4.0 base score is 6.0, indicating medium severity, with local attack vector, low attack complexity, no privileges required, user interaction required, and high scope and security impact changes.
Potential Impact
An attacker can cause BuildKit to perform unintended file operations on special file types, potentially blocking operations or, if BuildKit runs with root privileges, gaining unintended access to host devices. This could disrupt build processes or expose host system resources to unauthorized access.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time. Users should monitor vendor communications for updates and avoid running BuildKit with unnecessary root privileges as a precaution.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Docker
- Date Reserved
- 2026-09-17T17:18:00.217Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac3e69d2cdf04f65628b489
Added to database: 10/05/2026, 18:04:13 UTC
Last enriched: 10/05/2026, 18:18:46 UTC
Last updated: 10/05/2026, 19:19:10 UTC
Views: 9
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