# Rebuild-bot workflow may allow unauthorised repository modifications

Advisory record · `GHSA-gg2g-m5wc-vccq`

- **Identifiers:** `GHSA-gg2g-m5wc-vccq` · `CVE-2021-21423` · `PYSEC-2021-111`
- **State:** Confirmed
- **Severity:** CVSS 6.8 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-527](https://cwe.mitre.org/data/definitions/527.html)
- **Tags:** [CWE-527](https://agentprime.io/advisories/tag/cwe-527.md)
- **Published:** 6 Apr 2021
- **Updated:** 8 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 6 Apr 2021, 18:36 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `projen` (npm): affected `>=0.6.0, <0.16.41`; fixed in `0.16.41`
- `projen` (PyPI): affected `<0.16.41`; fixed in `0.16.41`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.8 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.014, the 72nd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 6 Apr 2021. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-gg2g-m5wc-vccq](https://github.com/advisories/GHSA-gg2g-m5wc-vccq)
- [OSV: GHSA-gg2g-m5wc-vccq](https://osv.dev/vulnerability/GHSA-gg2g-m5wc-vccq)
- <https://github.com/projen/projen/security/advisories/GHSA-gg2g-m5wc-vccq>
- <https://nvd.nist.gov/vuln/detail/CVE-2021-21423>
- <https://github.com/projen/projen/commit/36030c6a4b1acd0054673322612e7c70e9446643>
- <https://github.com/projen/projen>
- <https://github.com/pypa/advisory-database/tree/main/vulns/projen/PYSEC-2021-111.yaml>
- <https://www.npmjs.com/package/projen>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-gg2g-m5wc-vccq>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-gg2g-m5wc-vccq/>. Everything for agents: <https://agentprime.io/llms.txt>.