Middleware Flaw in ag-ui Protocol Affects Remote Functionality
CVE-2026-101100

5.3MEDIUM

Key Information:

Vendor

Ag-ui-protocol

Status
Ag-ui
Vendor
CVE Published:
28 September 2026

What is CVE-2026-101100?

A vulnerability has been identified in the ag-ui protocol specifically within the Middleware component. This flaw exists in the FilterToolCallsMiddleware function located in the file sdks/typescript/packages/client/src/middleware/filter-tool-calls.ts. An attacker could exploit this vulnerability remotely, leading to incomplete cleanup of certain operations. Users are urged to upgrade to version 2026-09-08, which addresses the issue with patch c346119fe870b70f5c19738ee5119f3e1456e59d to mitigate potential risks.

Affected Version(s)

ag-ui 2026-09-07

ag-ui 2026-09-08

References

https://vuldb.com/vuln/410975
vdb-entrytechnical-description
https://vuldb.com/vuln/410975/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-101100
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

meraklbz (VulDB User)
.