---
id: CVE-2026-120235
title: ag-ui-protocol ag-ui SSE Parser sse.ts parseSSEStream resource consumption
summary: >-
  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…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-400
  - CWE-404
vendor: ag-ui-protocol
product: ag-ui
affected:
  - ag-ui 0.0.1
  - ag-ui 0.0.2
  - ag-ui 0.0.3
  - ag-ui 0.0.4
  - ag-ui 0.0.5
  - ag-ui 0.0.6
  - ag-ui 0.0.7
  - ag-ui 0.0.8
  - ag-ui 0.0.9
  - ag-ui 0.0.10
  - ag-ui 0.0.11
  - ag-ui 0.0.12
  - ag-ui 0.0.13
  - ag-ui 0.0.14
  - ag-ui 0.0.15
  - ag-ui 0.0.16
  - ag-ui 0.0.17
  - ag-ui 0.0.18
  - ag-ui 0.0.19
  - ag-ui 0.0.20
  - ag-ui 0.0.21
  - ag-ui 0.0.22
  - ag-ui 0.0.23
  - ag-ui 0.0.24
  - ag-ui 0.0.25
  - ag-ui 0.0.26
  - ag-ui 0.0.27
  - ag-ui 0.0.28
  - ag-ui 0.0.29
  - ag-ui 0.0.30
  - ag-ui 0.0.31
  - ag-ui 0.0.32
  - ag-ui 0.0.33
  - ag-ui 0.0.34
  - ag-ui 0.0.35
  - ag-ui 0.0.36
  - ag-ui 0.0.37
  - ag-ui 0.0.38
  - ag-ui 0.0.39
  - ag-ui 0.0.40
  - ag-ui 0.0.41
  - ag-ui 0.0.42
  - ag-ui 0.0.43
  - ag-ui 0.0.44
  - ag-ui 0.0.45
  - ag-ui 0.0.46
  - ag-ui 0.0.47
  - ag-ui 0.0.48
  - ag-ui 0.0.49
  - ag-ui 0.0.50
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-02T17:15:20.466792Z'
exploitAvailable: true
published: '2026-11-01'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T17:41:44.705Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120235'
references:
  - url: 'https://vuldb.com/vuln/429594'
    label: >-
      VDB-429594 | ag-ui-protocol ag-ui SSE Parser sse.ts parseSSEStream
      resource consumption
  - url: 'https://vuldb.com/vuln/429594/cti'
    label: 'VDB-429594 | CTI Indicators (IOB, IOC, TTP, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-120235'
    label: CVE-2026-120235 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1015147'
    label: 'Submit #1015147 | ag-ui-protocol ag-ui <=0.0.58 CWE-400'
  - url: 'https://github.com/ag-ui-protocol/ag-ui/issues/2522'
  - url: 'https://github.com/ag-ui-protocol/ag-ui/pull/2627'
  - url: >-
      https://github.com/ag-ui-protocol/ag-ui/commit/9e7b2b00bce215bbf731f1e6094f63812527c432
  - url: 'https://github.com/ag-ui-protocol/ag-ui/releases/tag/release/2026-10-30'
  - url: 'https://github.com/ag-ui-protocol/ag-ui/'
tags:
  - cve.org
  - exploit-available
epss: 0.00354
epssPercentile: 0.29252
ingestedAt: '2026-11-05T19:30:42.743Z'
---

## Overview

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.

## Affected

- `ag-ui 0.0.1`
- `ag-ui 0.0.2`
- `ag-ui 0.0.3`
- `ag-ui 0.0.4`
- `ag-ui 0.0.5`
- `ag-ui 0.0.6`
- `ag-ui 0.0.7`
- `ag-ui 0.0.8`
- `ag-ui 0.0.9`
- `ag-ui 0.0.10`
- `ag-ui 0.0.11`
- `ag-ui 0.0.12`
- `ag-ui 0.0.13`
- `ag-ui 0.0.14`
- `ag-ui 0.0.15`
- `ag-ui 0.0.16`
- `ag-ui 0.0.17`
- `ag-ui 0.0.18`
- `ag-ui 0.0.19`
- `ag-ui 0.0.20`
- `ag-ui 0.0.21`
- `ag-ui 0.0.22`
- `ag-ui 0.0.23`
- `ag-ui 0.0.24`
- `ag-ui 0.0.25`
- `ag-ui 0.0.26`
- `ag-ui 0.0.27`
- `ag-ui 0.0.28`
- `ag-ui 0.0.29`
- `ag-ui 0.0.30`
- `ag-ui 0.0.31`
- `ag-ui 0.0.32`
- `ag-ui 0.0.33`
- `ag-ui 0.0.34`
- `ag-ui 0.0.35`
- `ag-ui 0.0.36`
- `ag-ui 0.0.37`
- `ag-ui 0.0.38`
- `ag-ui 0.0.39`
- `ag-ui 0.0.40`
- `ag-ui 0.0.41`
- `ag-ui 0.0.42`
- `ag-ui 0.0.43`
- `ag-ui 0.0.44`
- `ag-ui 0.0.45`
- `ag-ui 0.0.46`
- `ag-ui 0.0.47`
- `ag-ui 0.0.48`
- `ag-ui 0.0.49`
- `ag-ui 0.0.50`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.