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

> Attackers can bypass command permission gates in Mistral Vibe to execute arbitrary commands via prompt-transform tricks, risking full terminal compromise.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-m84r-3mrm-j4p8

## What is CVE-2026-109429?

CVE-2026-109429 is a high-severity command injection vulnerability in mistralai mistral-vibe, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-436 (Interpretation Conflict)

## Which versions are affected by CVE-2026-109429?


## How do I fix CVE-2026-109429?

No fix has been published for CVE-2026-109429 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-109429 being exploited?

There is no known exploitation of CVE-2026-109429 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-109429 and fix it if it is affected.

What it is: CVE-2026-109429 is a high-severity command injection vulnerability in mistralai mistral-vibe, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-109429 in the wild and no public exploit code.

Affected product: mistralai mistral-vibe. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-109429/ (Markdown: https://insights.sbomify.com/CVE-2026-109429/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-109429
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-109429
- OSV: https://osv.dev/vulnerability/CVE-2026-109429

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-109429/
Summaries are generated and may contain mistakes; the official description above is the record.