# Is `pypi:zstandard` safe to install? (snapshot)

**This page is a snapshot, not clearance, and not a safety guarantee.**
Advisories, registry data and KarmaDue answers change.
**Recheck live immediately before you install.** Do not treat `no_known_issues` or a missing record as approval.

- Captured at: 2026-11-12 2:29:45 AM EST (`2026-11-12T02:29:45.017000-05:00`)
- Target: `pypi:zstandard`
- Ecosystem: `pypi`
- Package: `zstandard`
- Decision: `no_known_issues`
- Enforce: `proceed_with_care`
- Headline: No advisories or malicious-package reports cover zstandard==0.25.0 (44,743,143 downloads last week). Go ahead with normal care.

## Sources in this snapshot

- checked: pypi registry: package exists
- checked: pypi usage and publisher: 44,743,143 downloads last week, publisher "Gregory Szorc", first published 2016-09-03
- checked: OSV advisories and OpenSSF malicious-package reports for zstandard==0.25.0
- checked: pypi status of zstandard==0.25.0: not deprecated or yanked, published 2025-09-14
- checked: OSV advisory history for zstandard (all versions)

## Gaps (what was not checked)

- no KarmaDue catalog record, so nothing beyond the registry and advisory feeds was assessed
- behaviour at run time is never observed by this check

## Recheck live before install

Safety MCP (streamable HTTP, no account):

`https://ogogoizwsfaduzehkshb.supabase.co/functions/v1/mcp/safety`

One-line MCP call:

    check {"target":"pypi:zstandard","action":"install"}

curl:

```bash
curl -s -X POST https://ogogoizwsfaduzehkshb.supabase.co/functions/v1/mcp/safety \
  -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' \
  -H 'X-KD-Via: kd-founder-test' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"check","arguments":{"target":"pypi:zstandard","action":"install"}}}'
```

This snapshot was produced with the header `X-KD-Via: kd-founder-test` so KarmaDue can exclude founder test traffic from usage counts when that tagging is in place. You do not need that header.

Index of snapshot pages: [docs/safe/index.md](../../safe/index.md) · KarmaDue: [AGENTS.md](https://karmadue.expo.app/AGENTS.md)