CVE-2026-120235 Details
Description
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.
A denial-of-service vulnerability has been identified in the AG-UI protocol's TypeScript client, specifically in versions through 0.0.58. The issue arises in the SSE parser, where the function 'parseSSEStream' accumulates data in a buffer without any size limit. This unbounded growth can lead to excessive memory usage and potential application crashes. The vulnerability can be exploited remotely by streaming data that bypasses the expected event boundaries, causing the buffer to expand indefinitely. This flaw has been publicly disclosed and exploited before the release of the patch.
Users can upgrade to AG-UI TypeScript client version 0.0.58 or later, where this vulnerability has been addressed. The patch involves capping the buffer size in the SSE and protobuf parsers to prevent unbounded accumulation.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 1, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ag-ui-protocol/ag-ui/ | [email protected] | Vendor |
| https://github.com/ag-ui-protocol/ag-ui/commit/9e7b2b00bce215bbf731f1e6094f63812527c432 | [email protected] | Source CodeVendor |
| https://github.com/ag-ui-protocol/ag-ui/issues/2522 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/ag-ui-protocol/ag-ui/pull/2627 | [email protected] | Issue TrackingVendor |
| https://github.com/ag-ui-protocol/ag-ui/releases/tag/release/2026-10-30 | [email protected] | Release NotesVendor |
| https://vuldb.com/cve/CVE-2026-120235 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1015147 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/429594 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/429594/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
| CWE-404 | Improper Resource Shutdown or Release | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ag-ui-protocol ag-ui | <= 0.0.58 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Nov 1, 2026 | New CVE Received | [email protected] |