CVE-2026-120235: DoS (CVSS 4.3)

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.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-404 CWE-404

References

Other References

https://github.com/ag-ui-protocol/ag-ui/ https://github.com/ag-ui-protocol/ag-ui/commit/9e7b2b00bce215bbf731f1e6094f63812527c432 https://github.com/ag-ui-protocol/ag-ui/issues/2522 https://github.com/ag-ui-protocol/ag-ui/pull/2627 https://github.com/ag-ui-protocol/ag-ui/releases/tag/release/2026-10-30 https://vuldb.com/cve/CVE-2026-120235 https://vuldb.com/submit/1015147 https://vuldb.com/vuln/429594 https://vuldb.com/vuln/429594/cti

Frequently Asked Questions

What is CVE-2026-120235? +

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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-120235? +

CVE-2026-120235 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2026-120235? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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