Denial of Service Vulnerability in NST Labs Tech Nstbrowser Local Agent Management Service
CVE-2026-122020

5.3MEDIUM

Key Information:

Vendor

Nst Labs Tech

Status
Nstbrowser
Vendor
CVE Published:
4 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-122020?

A security flaw has been identified in NSTbrowser up to version 1.2.1, centered around the stopAllBrowsers function in the Local Agent Management Service. This vulnerability allows an attacker to perform remote manipulation, leading to a denial of service condition. The exploit has been publicly disclosed, potentially making it accessible for malicious actors. Despite early notifications to the vendor regarding this issue, no acknowledgment or response has been received.

Affected Version(s)

Nstbrowser 1.2.0

Nstbrowser 1.2.1

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-2026-122020 - Proof of Concept

References

https://vuldb.com/vuln/431086
vdb-entrytechnical-description
https://vuldb.com/vuln/431086/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-122020
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:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

wilson888 (VulDB User)
VulDB CNA Team
.