Input Validation Vulnerability in ag-ui Transport Decoder by ag-ui-protocol
CVE-2026-120236

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-2026-120236?

A vulnerability has been identified in the ag-ui-protocol's ag-ui up to version 0.0.58, specifically within the Transport Decoder Handler component. This issue arises from improper input validation mechanisms, which could be exploited remotely by attackers. Public knowledge of the exploit allows for potential attacks, emphasizing the importance of immediate action. Users are strongly encouraged to upgrade to the latest version as identified in the patch 660182b973a44b8eda5484b14b88eb9cc251edc4 to mitigate this risk.

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-2026-120236 - Proof of Concept

References

https://vuldb.com/vuln/429595
vdb-entry
https://vuldb.com/vuln/429595/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-120236
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
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)
.