# virtualenv: Bash activator leaves the --prompt value unescaped in PS1 when promptvars is off, so prompt expansion later executes it (regression in 21.14.9)

Advisory record · `GHSA-cx6f-vjhg-g3cc`

- **Identifiers:** `GHSA-cx6f-vjhg-g3cc` · `BIT-virtualenv-2026-115586` · `CVE-2026-115586`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-78](https://cwe.mitre.org/data/definitions/78.html)
- **Tags:** [Command injection](https://agentprime.io/advisories/tag/command-injection.md)
- **Published:** 23 Oct 2026
- **Updated:** 29 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 23 Oct 2026, 20:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `virtualenv` (PyPI): affected `>=21.14.9, <21.14.13`; fixed in `21.14.13`

## 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

- 7.1 High, CVSS 4.0: `CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0027, the 19th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:07 UTC: First seen by agentprime
- 31 Oct 2026, 14:07 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-cx6f-vjhg-g3cc)

## Sources

- [GitHub Advisory Database: GHSA-cx6f-vjhg-g3cc](https://github.com/advisories/GHSA-cx6f-vjhg-g3cc)
- [OSV: GHSA-cx6f-vjhg-g3cc](https://osv.dev/vulnerability/GHSA-cx6f-vjhg-g3cc)
- <https://github.com/pypa/virtualenv/security/advisories/GHSA-cx6f-vjhg-g3cc>
- <https://github.com/pypa/virtualenv/pull/3466>
- <https://github.com/pypa/virtualenv/commit/3598e201f6f044e389136b2347a8a919ac03c5f4>
- <https://github.com/pypa/virtualenv>
- <https://github.com/pypa/virtualenv/releases/tag/21.14.13>

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-cx6f-vjhg-g3cc>, 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-cx6f-vjhg-g3cc/>. Everything for agents: <https://agentprime.io/llms.txt>.