# CVE-2026-8756: fishaudio Bert-VITS2 Gradio webui_preprocess.py generate_config path traversal

> Remote attackers can exploit a path traversal vulnerability in the Bert-VITS2 Gradio interface to read or modify arbitrary files on the server.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 May 2026
- **Updated:** 18 May 2026
- **Also known as:** GHSA-g26q-578c-pc62

## What is CVE-2026-8756?

CVE-2026-8756 is a medium-severity path traversal vulnerability in fishaudio Bert-VITS2, published on 17 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in fishaudio Bert-VITS2 up to 8f7fbd8c4770965225d258db548da27dc8dd934c. The impacted element is the function generate_config of the file webui_preprocess.py of the component Gradio Interface. Such manipulation of the argument data_dir leads to path traversal. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This product does not use versioning. This is why information about affected and unaffected releases are unavailable. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-8756?


## How do I fix CVE-2026-8756?

No fix has been published for CVE-2026-8756 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8756 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8756 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8756 and fix it if it is affected.

What it is: CVE-2026-8756 is a medium-severity path traversal vulnerability in fishaudio Bert-VITS2, published on 17 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8756 exists.

Affected product: fishaudio Bert-VITS2. 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-2026-8756/ (Markdown: https://insights.sbomify.com/CVE-2026-8756/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8756
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8756
- OSV: https://osv.dev/vulnerability/CVE-2026-8756

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-8756/
Summaries are generated and may contain mistakes; the official description above is the record.