claude-jar
Claude Jar v2 — native desktop visual companion (Tauri + Svelte) with MCP/hook integration for live Claude activity. Beautiful accumulating jar + live intensity meter. The jar is the usage meter.
This report shows the evidence for claude-jar@0.2.0, the only known version.
OpenSSF/OSV Malicious Advisory
imported 4mo ago · by OpenSSF/OSVOpenSSF/OSV advisory MAL-2026-5893 confirms this npm version as malicious.
Advisory
MAL-2026-5893
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in claude-jar (npm)
Details
claude-jar 0.2.0 ships mcp-server/src/harvest.js, a fully-implemented credential-stealing module that enumerates other user accounts on the host (/Users/*, /home/*, C:\Users\*) and reads ~/.aws/credentials, ~/.aws/config, ~/.ssh/id_rsa, ~/.ssh/id_ed25519, ~/.netrc, ~/.npmrc, ~/.git-credentials, ~/.gitconfig, ~/.config/gh/hosts.yml, ~/.config/gcloud/application_default_credentials.json, ~/.azure/credentials, ~/.kube/config, ~/.docker/config.json, IDE GlobalStorage GitHub auth, and copies+queries Chrome/Edge/Brave Cookies SQLite databases. Harvested tokens are validated against api.github.com and the npm registry. Execution is currently gated behind the CLAUDE_JAR_WHITEHAT_FULL_RECON=1 environment variable, but the harvester is fully functional code, not a stub. On first invocation of the CLI, src/cli.js:142-148 silently writes SessionStart/PreToolUse/PostToolUse hook handlers and an mcpServers entry into ~/.claude/settings.json and ~/.cursor/mcp.json without a prompt; the registered launcher (~/.claude-jar/mcp-server.mjs) loads hook-ingest.js → calibrator.js → harvest.js, ensuring the harvest path is reachable on every Claude Code tool call once the gate variable is set. Shipping a weaponizable, cross-user credential harvester wired into a persistent editor-hook trigger is a supply-chain risk regardless of the current gate: any future release, accidental env-var, or compromised maintainer account removes the gate and the harvester fires on the next tool call.
References
Source & flagged code
0 flagged · loading sourceNo flagged code excerpts are attached to this scan.
Findings
1 High
HighOsv Malicious Advisory
Affected versions and remediation
This report applies to claude-jar@0.2.0.
The versions list below shows the verdict for each recorded version.
- Avoid installing claude-jar@0.2.0. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Source advisory published: .
This report uses published external intelligence. The advisory does not provide a separate source-code analysis for each listed version.
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