LB-LINK Router AC450M 4.0.0 libshare.so bs_SetLimitCli_info command injection

Summaryinfo

A vulnerability classified as very critical has been found in LB-LINK Router AC450M 4.0.0. This vulnerability affects the function bs_SetLimitCli_info of the file libshare.so. The manipulation leads to command injection. This vulnerability is documented as CVE-2026-35869. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in LB-LINK Router AC450M 4.0.0 and classified as very critical. This issue affects the function bs_SetLimitCli_info of the file libshare.so. The manipulation with an unknown input leads to a command injection vulnerability. Using CWE to declare the problem leads to CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A Command Injection vulnerability exists in the bs_SetLimitCli_info function within the libshare.so library of LB-link Router AC450M V4.0.0. This flaw occurs due to insufficient validation and sanitization of user-supplied input before it is passed to a system-level command execution context. An attacker can exploit this vulnerability by injecting specially crafted shell metacharacters or payloads into the vulnerable parameter, resulting in the execution of arbitrary operating system commands.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-35869 since 04/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/27/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Router Operating System

Vendor

• LB-LINK

Name

• Router AC450M

Version

• 4.0.0

CPE 2.3info

• 🔒

CPE 2.2info

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