himalaya
Himalaya CLI: IMAP/SMTP email from terminal.
60
72%
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Critical
Do not install without reviewing
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tessl review fix ./skills/email/himalaya/SKILL.mdSecurity
1 critical severity finding. Installing this skill is not recommended: please review these findings carefully if you do intend to do so.
E005: Suspicious download URL detected in skill instructions.
What this means
Detected a suspicious URL in the skill instructions that could lead the agent to download and execute malicious scripts or binaries. This includes links to executables from untrusted sources, typosquatting of official packages, URL shorteners that obscure the destination, and personal file hosting services.
Why it was flagged
The raw GitHubusercontent URL pipes an external install.sh directly to sh (executing remote code), which is a high-risk distribution pattern; the provider.com OAuth endpoints are non-download endpoints and not suspicious here.
Low
Low-risk findings.
2 low severity findings. Worth noting, but not necessarily harmful.
W011: Third-party content exposure detected (indirect prompt injection risk).
What this means
The skill exposes the agent to untrusted, user-generated content from public third-party sources, creating a risk of indirect prompt injection. This includes browsing arbitrary URLs, reading social media posts or forum comments, and analyzing content from unknown websites.
Why it was flagged
The skill’s required workflow invokes the `himalaya` CLI to read messages (e.g., via `himalaya message read` / `message export`), and the runtime LLM context would be fed the outsider-authored email content (public mailbox message bodies/metadata) returned by that CLI.
W012: Unverifiable external dependency detected (runtime URL that controls agent).
What this means
The skill fetches instructions or code from an external URL at runtime, and the fetched content directly controls the agent’s prompts or executes code. This dynamic dependency allows the external source to modify the agent’s behavior without any changes to the skill itself.
Why it was flagged
The SKILL.md installation step runs a remote install script via curl piped to sh (https://raw.githubusercontent.com/pimalaya/himalaya/master/install.sh), which fetches and executes remote code at runtime and is presented as a required way to install the himalaya CLI.
- Repository
- NousResearch/hermes-agent
- Commit
6a8d318
- Audited
- Security analysis
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