# CVE-2026-35867: LB-LINK AC1900_AZ2 command injection in libshare.so

Source: https://junglewise.ai/threats/cve-2026-35867-lb-link-ac1900-az2-command-injection-in-libshare-so  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-13. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-35867 · Severity: low · CVSS 3.1 · Published 2026-09-13

A command injection vulnerability exists in the LB-LINK AC1900_AZ2 router's network management library that allows unauthenticated remote attackers to execute arbitrary commands on the device. The vulnerability is triggered through a web interface endpoint that processes client bandwidth limit configurations without proper input validation, potentially allowing an attacker to gain control of the router and access the network it protects.

Vendors: [LB-Link](https://junglewise.ai/threats/vendors/lb-link).

## Quick answers

**Is CVE-2026-35867 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-35867 being exploited in the wild.

**How severe is CVE-2026-35867?** Low severity, with a CVSS score of 3.1, published 13 September 2026.

**Which products and versions are affected?** LB-Link AC1900 AZ2 V1.0.2.

**Is there a fix for CVE-2026-35867?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-35867 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-35867?** Check whether you run LB-Link AC1900 AZ2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a command injection flaw in the bs_SetLimitCli_info function within libshare.so, a core library of the LB-LINK AC1900_AZ2 router running firmware version V1.0.2. The vulnerable endpoint is "POST /goform/set_LimitClient_cfg", which fails to properly sanitize shell metacharacters in user-supplied input before passing it to system command execution. An unauthenticated network-adjacent attacker can exploit this by crafting a malicious POST request with shell command injection payloads to achieve remote code execution. No administrative credentials are required for exploitation, and patches availability is not mentioned.

## Affected products

- LB-LINK AC1900_AZ2 V1.0.2

## Timeline

- 2026-09-13: disclosed

## References

- [https://github.com/Orcust-Automaton/Vulnerability/blob/main/LB-Link/AC1900_AZ2/bs_SetLimitCli_info.md](https://github.com/Orcust-Automaton/Vulnerability/blob/main/LB-Link/AC1900_AZ2/bs_SetLimitCli_info.md)