Containarium v0.120.1

What changed

Added

• flag or refuse plaintext dumps; backup status preflight (#3169) (#3199)
• backups:verify scope for verifier tokens (#3186) (#3200)
• make the plain-HTTP peer state visible (#3079 part 2) (#3215)

Fixed

• revoke only the registry entry the caller owns (#3187) (#3203)
• refuse to trust interfaces carrying instance veths as uplinks (#3185) (#3202)
• validate health knobs up front, cap them, quote the value (#3216)
• share parse_l4's guard with the virtual-patch deny and flow accounting (#3166) (#3209)

Documentation

• drop the stale duplicate #3182 entry (#3210)
• document that box_ip 0 also disables the spoofed-source drop (#3185 nit) (#3211)

Internal

• cut v0.120.1 — go-jose 4.1.6 (CVE-2026-116587) and post-v0.120.0 fixes (#3223)
• bump github.com/go-jose/go-jose/v4 to v4.1.6 (CVE-2026-116587) (#3220)

Full diff: v0.120.0...v0.120.1

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Containarium v0.120.1

The open-source, self-hostable, agent-native sandbox.

Binaries

Four binaries ship in this release:

Binary	Where it runs	What it does
containariumd	The host	The platform daemon plus host-side admin commands.
containarium	Your laptop / CI (linux, macOS, windows)	The client CLI: create, list, expose-port, ssh-config, etc. against a server (--server).
mcp-server	Your laptop	The platform MCP — outside-the-box admin (create_container, list_containers, expose_port, list_backends). Wire it into Claude Code / Cursor.
agent-box	Inside each Containarium container	The in-the-box MCP — shell_exec, read_file, write_file, etc. Reached over stdio, typically via SSH.

Quick install (Linux host)

curl -fsSL https://raw.githubusercontent.com/footprintai/containarium/v0.120.1/hacks/install.sh | sudo bash

Manual install (any binary, any platform)

# containariumd daemon (Linux x86_64 host)
curl -L -o /usr/local/bin/containariumd \
  https://github.com/footprintai/containarium/releases/download/v0.120.1/containariumd-linux-amd64
chmod +x /usr/local/bin/containariumd
ln -sf /usr/local/bin/containariumd /usr/local/bin/containarium

# containarium client CLI (your laptop, e.g. macOS arm64)
curl -L -o /usr/local/bin/containarium \
  https://github.com/footprintai/containarium/releases/download/v0.120.1/containarium-darwin-arm64
chmod +x /usr/local/bin/containarium

# Windows: the same client CLI (create/list/ssh/… against a remote server)
# PowerShell:
#   curl.exe -L -o containarium.exe `
#     https://github.com/footprintai/containarium/releases/download/v0.120.1/containarium-windows-amd64.exe

# platform MCP (your laptop, e.g. macOS arm64)
curl -L -o /usr/local/bin/mcp-server \
  https://github.com/footprintai/containarium/releases/download/v0.120.1/mcp-server-darwin-arm64
chmod +x /usr/local/bin/mcp-server

# agent-box (drop into your container image, Linux x86_64)
curl -L -o /usr/local/bin/agent-box \
  https://github.com/footprintai/containarium/releases/download/v0.120.1/agent-box-linux-amd64
chmod +x /usr/local/bin/agent-box

Verify checksums via SHA256SUMS.txt.

SBOMs

Each Linux binary has an SPDX 2.3 SBOM next to it (<binary>-linux-amd64.spdx.json), generated from the shipped file and listed in SHA256SUMS.txt. The container images carry their own SBOM and provenance attestations.

Signatures

Every file on this page has a keyless cosign signature next to it, <file>.sigstore.json, made by this release workflow through GitHub OIDC. Verify with cosign verify-blob --bundle <file>.sigstore.json --certificate-identity https://github.com/FootprintAI/Containarium/.github/workflows/release.yml@refs/tags/v0.120.1 --certificate-oidc-issuer https://token.actions.githubusercontent.com <file>. See docs/security/VERIFYING-RELEASES.md.

Kubernetes (Helm)

Chart version 0.120.1 (installs the v0.120.1 daemon image):

helm install containarium oci://ghcr.io/footprintai/charts/containarium-k8s \
  --version 0.120.1 \
  --set daemon.jwtSecret="$(openssl rand -hex 24)" \
  --set gateway.upstreamKeySecret=sshpiper-upstream-key \
  --set-file gateway.upstreamPublicKey=./sshpiper_upstream.pub

MCP client setup

Wire the platform MCP into Claude Code (~/.claude.json):

{
  "mcpServers": {
    "containarium": {
      "command": "/usr/local/bin/mcp-server",
      "env": {
        "CONTAINARIUM_SERVER_URL": "http://your-host:8080",
        "CONTAINARIUM_JWT_TOKEN": "<your-token>"
      }
    }
  }
}

Wire agent-box for in-the-box file/shell ops:

{
  "mcpServers": {
    "containarium-box": {
      "command": "ssh",
      "args": ["user@your-box", "agent-box"]
    }
  }
}

See README.md for the full agent-native walkthrough.