CVE-2026-76490 Cisco Expressway Series Software Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-76490?
CVE-2026-76490 is a high-severity vulnerability in Cisco TelePresence Video Communication Server (VCS) Expressway, published on 21 Oct 2026.
Official description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76490 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.
Weakness: CWE-787
Which versions are affected by CVE-2026-76490?
How do I fix CVE-2026-76490?
No fix has been published for CVE-2026-76490 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-76490 being exploited?
There is no known exploitation of CVE-2026-76490 in the wild and no public exploit code.
Sources
Also known as GHSA-4h68-8g8q-39mj.