Stack-Based Buffer Overflow in LB-LINK BL-WR9000 Router
CVE-2026-4226

8.7HIGH

Key Information:

Vendor

Lb-link

Status
Bl-wr9000
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4226?

A stack-based buffer overflow vulnerability has been found in the LB-LINK BL-WR9000 router, specifically in the function sub_44E8D0 of the /goform/get_virtual_cfg file. This vulnerability can be exploited remotely, allowing attackers to manipulate the function and overflow the stack. Publicly available exploitation methods increase the risk of unauthorized access and control over the device. Despite being informed about this issue, LB-LINK has not yet responded to the disclosure.

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Affected Version(s)

BL-WR9000 2.4.9

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-2026-4226 - Proof of Concept

References

https://vuldb.com/?id.351149
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351149
signaturepermissions-required
https://vuldb.com/?submit.771207
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
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

jfkk (VulDB User)
VulDB
JSON
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