# CVE-2026-109428: Mistral Vibe < 2.25.5 Permission Bypass via Bash Line Continuation

> CVE-2026-109428: Mistral Vibe < 2.25.5 Permission Bypass via Bash Line Continuation. CVSS 8.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-109428
Last updated: 2026-10-13T19:30:29Z

- Published: 2026-10-13 18:17 UTC · Updated: 2026-10-13 19:30 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: 0.51%, 43th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-436

## Description

Mistral Vibe before 2.25.5 contains a permission validation bypass vulnerability that allows attackers to execute unauthorized commands by exploiting a parsing discrepancy between tree-sitter-bash and bash in handling backslash-newline line continuations in the \_extract\_commands() function of bash.py. Attackers can craft a command string where tree-sitter-bash extracts only an allowlisted prefix such as cd while bash joins the line continuation into a materially different and hidden command such as a curl request, causing resolve\_permission to grant ALWAYS permission while bash executes unauthorized arbitrary commands.

## 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-2026-109428)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-109428)
- [https://github.com/mistralai/mistral-vibe/commit/c069ffa1e12fb5f2487b489217c40ab97721d553](https://github.com/mistralai/mistral-vibe/commit/c069ffa1e12fb5f2487b489217c40ab97721d553)
- [https://github.com/mistralai/mistral-vibe/pull/1111](https://github.com/mistralai/mistral-vibe/pull/1111)
- [https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.5](https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.5)
- [https://www.vulncheck.com/advisories/mistral-vibe-permission-bypass-via-bash-line-continuation](https://www.vulncheck.com/advisories/mistral-vibe-permission-bypass-via-bash-line-continuation)

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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-2026-109428 · Markdown: https://rewindex.com/cve/CVE-2026-109428.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-109428 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:18.842Z