# CVE-2026-121614: Docker Sandboxes host Git executes repository-controlled programs

Status: published. Published: 2026-11-03. Updated: 2026-11-06.

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

- fix: Upgrade Docker Sandboxes to version 0.50.0 or later. (source: CNA: Docker)
- 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. (source: CNA: Docker)

## Affected products and versions

- Docker / Docker Sandboxes: ≥ 0.31.0; < 0.50.0 (affected, semver). Source: CNA: Docker; platforms: MacOS, Linux, Windows

## Severity and prioritization

- CVSS 4.0: 7.1 (high); 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; source: CNA: Docker

- CVSS 4.0: 7.1 (high); 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: security@docker.com

- CISA KEV: No listing in collected sources

- EPSS: 0.13% as of 2026-11-06; percentile 2.41%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-15

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://docs.docker.com/ai/sandboxes/ (CNA: Docker; product)

- https://docs.docker.com/ai/sandboxes/security/isolation/ (CNA: Docker; technical-description)

- https://github.com/docker/sbx-releases/releases/tag/v0.50.0 (CNA: Docker; release-notes)

- https://docs.docker.com/ai/sandboxes/ (security@docker.com)

- https://docs.docker.com/ai/sandboxes/security/isolation/ (security@docker.com)

- https://github.com/docker/sbx-releases/releases/tag/v0.50.0 (security@docker.com)

## Provenance

- CNA: Docker: https://www.cve.org/CVERecord?id=CVE-2026-121614; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121614; retrieved 2026-11-07; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-121614; retrieved 2026-11-06; source updated Not reported

Revision: ee9c8ce636dcb7f14d4eac697315ff03e474f713a87f4a749f2c8757a9ccda28

Canonical: https://y2.dev/cve/CVE-2026-121614

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.