# CVE-2026-109429: Mistral Vibe < 2.25.4 Bash Permission Bypass via ${var@P} Prompt-Transform

> CVE-2026-109429: Mistral Vibe < 2.25.4 Bash Permission Bypass via ${var@P} Prompt-Transform. CVSS 8.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-109429
Last updated: 2026-10-16T23:16:58Z

- Published: 2026-10-13 18:22 UTC · Updated: 2026-10-16 23:16 UTC · Assigner: VulnCheck
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 0.56%, 46th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-436

## Description

Mistral Vibe before 2.25.4 contains a command permission gate bypass vulnerability that allows attackers to execute arbitrary commands by hiding a command substitution inside a single-quoted variable value that tree-sitter-bash static parsing cannot detect. Attackers can craft input such as embedding a command substitution within a single-quoted variable and re-expanding it with the ${var@P} prompt-transform operator so bash's promptvars feature executes the hidden command at runtime while only the trailing allowlisted command is classified, resulting in silent arbitrary command execution with the privileges of the agent's terminal session.

## Affected vendors and products

- mistralai: mistral-vibe

## Tracked companies

- [Mistral AI](https://rewindex.com/company/mistral-ai.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-109429)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-109429)
- [https://github.com/mistralai/mistral-vibe/commit/19b5b74faa78d0816b8d4d4c7d7543fc3520678c](https://github.com/mistralai/mistral-vibe/commit/19b5b74faa78d0816b8d4d4c7d7543fc3520678c)
- [https://github.com/mistralai/mistral-vibe/pull/1084](https://github.com/mistralai/mistral-vibe/pull/1084)
- [https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.4](https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.4)
- [https://www.vulncheck.com/advisories/mistral-vibe-bash-permission-bypass-via-var-p-prompt-transform](https://www.vulncheck.com/advisories/mistral-vibe-bash-permission-bypass-via-var-p-prompt-transform)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-109429 · Markdown: https://rewindex.com/cve/CVE-2026-109429.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-109429 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:21.283Z