# CVE-2026-101101: ag-ui-protocol ag-ui Middleware convert.ts JSON.parse uncaught exception

> Remote attackers can cause a denial of service via uncaught exceptions in the Middleware component's JSON parsing logic.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-chh6-2pfh-pc8w

## What is CVE-2026-101101?

CVE-2026-101101 is a medium-severity denial of service vulnerability in ag-ui-protocol ag-ui, published on 28 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been found in ag-ui-protocol ag-ui up to 2026-09-07. This issue affects the function JSON.parse of the file legacy/convert.ts of the component Middleware. The manipulation leads to uncaught exception. Remote exploitation of the attack is possible. Upgrading to version 2026-09-08 is capable of addressing this issue. The identifier of the patch is 30f8c794d5b73df5c610153043db502b2cc106cc. Upgrading the affected component is recommended.

Weakness: CWE-248 (Uncaught Exception)

## Which versions are affected by CVE-2026-101101?


## How do I fix CVE-2026-101101?

No fix has been published for CVE-2026-101101 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-101101 being exploited?

There is no known exploitation of CVE-2026-101101 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-101101 and fix it if it is affected.

What it is: CVE-2026-101101 is a medium-severity denial of service vulnerability in ag-ui-protocol ag-ui, published on 28 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-101101 in the wild and no public exploit code.

Affected product: ag-ui-protocol ag-ui. 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-2026-101101/ (Markdown: https://insights.sbomify.com/CVE-2026-101101/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-101101
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-101101
- OSV: https://osv.dev/vulnerability/CVE-2026-101101

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-101101/
Summaries are generated and may contain mistakes; the official description above is the record.