CVE-2026-4226: A weakness has been identified in LB-LINK BL-WR9000 2.4.9

This month

HIGH 8.8MITIGATE

CVE-2026-4226 is a high-severity flaw (CVSS 8.8) affecting bl-wr9000 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-119, CWE-121, CWE-787
Published	2026-03-16
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: lb-link

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-16 14:20 UTCPublished CVE record published
2026-06-17 10:56 UTCUpdated Record last modified

lb-link bl-wr9000 firmware MITIGATE

Affected: 2.4.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.4.9

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4226?

bl-wr9000 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4226 being exploited?

CVE-2026-4226 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4226 affect?

CVE-2026-4226 affects bl-wr9000 firmware. Severity is high (CVSS 8.8). 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 fr

How urgent is CVE-2026-4226?

Priority 49/100. High severity; Public exploit reference

Related CVEs

CVE-2026-4228 MEDIUM 6.3 MITIGATE A vulnerability was detected in LB-LINK BL-WR9000 2.4.9
CVE-2026-4227 HIGH 8.8 MITIGATE A security vulnerability has been detected in LB-LINK BL-WR9000 2.4.9
CVE-2025-45988 CRITICAL 9.8 MITIGATE MITIGATE Blink routers BL-WR9000 V2.4.9 , BL-AC2100_AZ3 V1.0.4, BL-X10_AC8 v1.0.5 , BL-LTE300 v1.2.3, BL-F1200_AT1 v1.0
CVE-2025-45987 CRITICAL 9.8 MITIGATE MITIGATE Blink routers BL-WR9000 V2.4.9 , BL-AC2100_AZ3 V1.0.4, BL-X10_AC8 v1.0.5 , BL-LTE300 v1.2.3, BL-F1200_AT1 v1.0
CVE-2025-45986 CRITICAL 9.8 MITIGATE MITIGATE Blink routers BL-WR9000 V2.4.9 , BL-AC2100_AZ3 V1.0.4, BL-X10_AC8 v1.0.5 , BL-LTE300 v1.2.3, BL-F1200_AT1 v1.0

References

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