---
id: CVE-2026-101100
title: A flaw has been found in ag-ui-protocol ag-ui up to 2026-09-07
summary: >-
  A flaw has been found in ag-ui-protocol ag-ui up to 2026-09-07. This
  vulnerability affects the function FilterToolCallsMiddleware of the file
  sdks/typescript/packages/client/src/middleware/filter-tool-calls.ts of the
  component Middleware…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'
cwe:
  - CWE-459
vendor: ag-ui-protocol
product: ag-ui
affected:
  - ag-ui 2026-09-07
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T21:03:44.987'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101100'
references:
  - url: 'https://github.com/ag-ui-protocol/ag-ui/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/ag-ui-protocol/ag-ui/commit/c346119fe870b70f5c19738ee5119f3e1456e59d
    label: cna@vuldb.com
  - url: 'https://github.com/ag-ui-protocol/ag-ui/issues/2443'
    label: cna@vuldb.com
  - url: 'https://github.com/ag-ui-protocol/ag-ui/pull/2494'
    label: cna@vuldb.com
  - url: 'https://github.com/ag-ui-protocol/ag-ui/releases/tag/release/2026-09-08'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-101100'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/934980'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410975'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410975/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T17:47:46.613540Z'
ingestedAt: '2026-09-28T18:17:54.303Z'
---

## Overview

A flaw has been found in ag-ui-protocol ag-ui up to 2026-09-07. This vulnerability affects the function FilterToolCallsMiddleware of the file sdks/typescript/packages/client/src/middleware/filter-tool-calls.ts of the component Middleware. Executing a manipulation can lead to incomplete cleanup. The attack may be launched remotely. Upgrading to version 2026-09-08 is able to resolve this issue. This patch is called c346119fe870b70f5c19738ee5119f3e1456e59d. It is suggested to upgrade the affected component.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.