Resource Consumption Vulnerability in ag-ui-protocol ag-ui Product
CVE-2026-120235

5.3MEDIUM

Key Information:

Vendor

Ag-ui-protocol

Status
Ag-ui
Vendor
CVE Published:
1 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-120235?

A vulnerability has been identified in the ag-ui-protocol ag-ui product, specifically within the SSE Parser component’s parseSSEStream function in the sse.ts file. This vulnerability allows for remote manipulation resulting in excessive resource consumption. Attackers could exploit this issue from a distance, making it critical for users to apply the necessary patches. A patch identified by the commit 9e7b2b00bce215bbf731f1e6094f63812527c432 is available for upgrading the affected component.

Affected Version(s)

ag-ui 0.0.1

ag-ui 0.0.2

ag-ui 0.0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-120235 - Proof of Concept

References

https://vuldb.com/vuln/429594
vdb-entrytechnical-description
https://vuldb.com/vuln/429594/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-120235
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ez-lbz (VulDB User)
.