Live › vulnerability › CVE-2026-120235
The AG-UI protocol TypeScript client parses server-sent event streams in a way that a crafted stream can make consume excessive resources. An attacker who can send such a stream to the client can degrade or stall the application using it.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-11-01 16:20 UTC. All times on this page are UTC.
Applications that use the AG-UI TypeScript client to read SSE streams from an agent backend are exposed, because the flaw is in the client-side stream parser that handles remote data. Systems that do not use the AG-UI client, or that only run it against trusted servers, can skip it. The sources do not say what input size or stream shape triggers the exhaustion.
No product ranges from the sources yet.
ag-ui-protocol or @ag-ui/client package in package.json and lockfiles, and check the installed version.parseSSEStream code path in sdks/typescript/packages/client/src/transform/sse.ts is in use.0.0.589e7b2b00bce215bbf731f1e6094f63812527c432Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
A security vulnerability has been detected in ag-ui-protocol ag-ui up to 0.0.58. Affected is the function parseSSEStream of the file sdks/typescript/packages/client/src/transform/sse.ts of the component SSE Parser. The manipulation leads to resource consumption. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The identifier of the patch is 9e7b2b00bce215bbf731f1e6094f63812527c432. The affected component should be upgraded.
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