Quick answers
- Is CVE-2026-101100 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-101100 being exploited in the wild.
- How severe is CVE-2026-101100?
- Medium severity, with a CVSS score of 5.4, published 28 September 2026.
- Which products and versions are affected?
- Ag-Ui-Protocol Ag-Ui up to 2026-09-07.
- Is there a fix for CVE-2026-101100?
- A patch was published on 2026-09-08: Version 2026-09-08, commit c346119fe870b70f5c19738ee5119f3e1456e59d Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-101100 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-101100?
- Check whether you run Ag-Ui-Protocol Ag-Ui at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The FilterToolCallsMiddleware in sdks/typescript/packages/client/src/middleware/filter-tool-calls.ts fails to clear blocked tool-call IDs on run boundaries, resulting in incomplete cleanup. This is a state management vulnerability in a client-side middleware component that processes agent tool calls. The patch clears blocked identifiers when execution runs complete, preventing residual state from one agent run from affecting subsequent operations.
Affected products
- ag-ui-protocol ag-ui up to 2026-09-07
Timeline
- 2026-09-28: disclosed
- 2026-09-08: patched: Version 2026-09-08, commit c346119fe870b70f5c19738ee5119f3e1456e59d