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9.8

Looking Glass before 1.3.5 allows remote code execution

CVE-2026-53611 · published 1 day ago
Summary

The Looking Glass tool (versions earlier than 1.3.5) can be tricked into running unauthorized commands on the server because it does not properly check certain input. This could let an attacker take control of the system that runs the tool. Upgrade to version 1.3.5 or later to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
as203038 looking-glass < 1.3.5
Original advisory text
Looking Glass is a modern, stateless network-diagnostic platform — a single self-contained Go binary that fronts a fleet of routers over SSH and exposes ping / traceroute / BGP lookups through a gR...
Looking Glass is a modern, stateless network-diagnostic platform — a single self-contained Go binary that fronts a fleet of routers over SSH and exposes ping / traceroute / BGP lookups through a gRPC (ConnectRPC) API, an embedded SvelteKit web UI, and a lg-cli client. Prior to version 1.3.5, there is an OS Command Injection vulnerability resulting from an unanchored regular expression in the input validation layer. This issue has been patched in version 1.3.5.
References
Severity
9.8 Critical
CVSS 3.1: 9.8 (MITRE)
Type
CWE-78OS Command Injection
Timeline
Published2 Sep 2026
Updated3 Sep 2026
First seen2 Sep 2026
Sources
CVE-2026-53611 · NVD
CVE-2026-53611 · MITRE
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