Critical Vulnerability in GPL Odorizers GPL750 Devices (CVE-2026-4436)
In April 2026, a critical vulnerability (CVE-2026-4436) was identified in GPL Odorizers' GPL750 devices, which are used for odorant injection in natural gas pipelines. This flaw allows low-privileged remote attackers to manipulate register values via Modbus packets, potentially leading to incorrect odorant levels being injected into gas lines. Affected versions include GPL750 (XL4) >=v1.0, GPL750 (XL4 Prime) >=v4.0, GPL750 (XL7) >=v13.0, and GPL750 (XL7 Prime) >=v18.4. The vulnerability has a CVSS v3 base score of 8.6, indicating high severity. ([gasodorizer.com](https://www.gasodorizer.com/odorization/gpl-750-odorant-injection/?utm_source=openai)) The exploitation of this vulnerability could result in significant safety hazards due to improper odorization of natural gas, which is essential for leak detection. Organizations using these devices are urged to update to the latest software versions and implement recommended mitigations to prevent potential exploitation. ([gasodorizer.com](https://www.gasodorizer.com/odorization/gpl-750-odorant-injection/?utm_source=openai))
Kill Chain