# CVE-2026-34430: ByteDance DeerFlow LocalSandboxProvider Host Bash Escape

> Attackers can escape the sandbox and execute arbitrary commands on the host by bypassing regex validation in the bash tool.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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:** 1 Apr 2026
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-gxx6-2vwg-3gc3

## What is CVE-2026-34430?

CVE-2026-34430 is a high-severity command injection vulnerability in Bytedance Inc. DeerFlow, published on 1 Apr 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

ByteDance DeerFlow versions prior to commit 92c7a20 contain a sandbox escape vulnerability in bash tool handling that allows attackers to execute arbitrary commands on the host system by bypassing regex-based validation using shell features such as directory changes and relative paths. Attackers can exploit the incomplete shell semantics modeling to read and modify files outside the sandbox boundary and achieve arbitrary command execution through subprocess invocation with shell interpretation enabled.

Weakness: CWE-184 (Incomplete List of Disallowed Inputs)

## Which versions are affected by CVE-2026-34430?

It affects 1 product.


Products: Deerflow Deerflow.

## How do I fix CVE-2026-34430?

No fix has been published for CVE-2026-34430 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34430 being exploited?

There is no known exploitation of CVE-2026-34430 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34430 and fix it if it is affected.

What it is: CVE-2026-34430 is a high-severity command injection vulnerability in Bytedance Inc. DeerFlow, published on 1 Apr 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-2026-34430 in the wild and no public exploit code.

Affected product: Bytedance Inc. DeerFlow. 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-2026-34430/ (Markdown: https://insights.sbomify.com/CVE-2026-34430/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34430
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34430
- OSV: https://osv.dev/vulnerability/CVE-2026-34430

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34430/
Summaries are generated and may contain mistakes; the official description above is the record.