CVE-2026-51540: Opener Project Opener

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by an integer underflow in the processing of connected explicit messages (SendUnitData).

Affected products

• Opener Project Opener: version 2.3.0 only

Published 2026-07-13. Last modified 2026-08-11.