CVE-2026-20156: Cisco Roomos

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco RoomOS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20156 are related to improper restriction of operations within the bounds of a memory buffer that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-119.

Affected products

• Cisco Roomos: before 11.32.6.0 (fixed in 11.32.6.0); from 26.0.1.2, before 26.5.2.2 (fixed in 26.5.2.2)
• Cisco Roomos Cloud: before 11.39.1.1 (fixed in 11.39.1.1); from 26.0.1.2, before 26.7.1.7 (fixed in 26.7.1.7)

Published 2026-07-15. Last modified 2026-08-14.