CVE-2026-121614

Docker Sandboxes host Git executes repository-controlled programs

Published Nov 3, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Description
Docker Sandboxes versions 0.31.0 before 0.50.0 do not neutralize repository-controlled Git configuration when running certain host-side Git commands. An attacker who can modify a host repository's Git configuration, for example through a direct-mode sandbox with the repository mounted read-write, can configure core.fsmonitor or another Git setting that invokes an external program. Git can execute the program during a later clone-mode fetch or, starting in version 0.39.0, an sbx kit push initiated by the user. The program runs on the host with the invoking user's permissions, outside the sandbox's microVM isolation. The read-only host repository mount provided to a clone-mode sandbox does not itself allow that sandbox to modify the host repository's Git configuration. The issue is fixed in version 0.50.0.

Remediation

Vendor Solution

Upgrade Docker Sandboxes to version 0.50.0 or later.


Vendor Workaround

Until upgrading, do not run clone-mode sandbox creation or start, or sbx kit push, in repositories whose Git configuration or .git metadata can be modified by untrusted code, such as a repository mounted read-write into another sandbox.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Docker Sandboxes versions 0.31.0 before 0.50.0 do not neutralize repository-controlled Git configuration when running certain host-side Git commands. An attacker who can modify a host repository's Git configuration, for example through a direct-mode sandbox with the repository mounted read-write, can configure core.fsmonitor or another Git setting that invokes an external program. Git can execute the program during a later clone-mode fetch or, starting in version 0.39.0, an sbx kit push initiated by the user. The program runs on the host with the invoking user's permissions, outside the sandbox's microVM isolation. The read-only host repository mount provided to a clone-mode sandbox does not itself allow that sandbox to modify the host repository's Git configuration. The issue is fixed in version 0.50.0.
Title Docker Sandboxes host Git executes repository-controlled programs
First Time appeared Docker
Docker docker Sandboxes
Weaknesses CWE-15
CPEs cpe:2.3:a:docker:docker_sandboxes:*:*:*:*:*:*:*:*
Vendors & Products Docker
Docker docker Sandboxes
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Docker
Published
Updated
Nov 6, 2026, 7:33 PM
Reserved
Nov 3, 2026, 4:37 PM
Status
Awaiting Analysis
Published
Nov 3, 2026, 10:19 PM
Modified
Nov 6, 2026, 9:40 PM