CVE-2026-76490 — Cisco Expressway Series Software Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Cisco / Cisco TelePresence Video Communication Server (VCS) Expressway	affected X8.11.2; affected X8.6; affected X8.11.3; affected X8.2.2; affected X8.8.3; affected X8.11.0; affected X12.5.2; affected X8.1.1; affected X8.9; affected X12.5.1; affected X12.5.6; affected X8.7.3; affected X12.6.0; affected X8.11.1; affected X8.5; affected X8.9.1; affected X8.10.2; affected X8.8.2; affected X8.5.3; affected X8.1; affected X8.9.2; affected X8.11.4; affected X12.5.4; affected X8.8.1; affected X8.2.1; affected X8.5.1; affected X8.6.1; affected X8.1.2; affected X8.8; affected X8.10.0; affected X12.5.3; affected X8.10.1; affected X12.5.7; affected X8.10.3; affected X8.7.1; affected X8.2; affected X12.5.8; affected X8.7; affected X8.5.2; affected X12.5.9; affected X12.5.0; affected X8.10.4; affected X8.7.2; affected X12.5.5; affected X12.6.1; affected X12.6.2; affected X12.6.3; affected X12.6.4; affected X12.7.0; affected X12.7.1; affected X14.0.0; affected X14.0.1; affected X14.0.2; affected X14.0.3; affected X14.0.4; affected X14.0.5; affected X14.0.6; affected X14.0.7; affected X14.0.8; affected X14.2.0; affected X14.0.9; affected X14.2.1; affected X14.2.2; affected X14.0.11; affected X14.2.5; affected X14.0.10; affected X14.2.6; affected X14.2.7; affected X14.3.0; affected X14.3.1; affected X14.3.2; affected X14.3.3; affected X15.0.0; affected X14.3.4; affected X14.3.5; affected X15.0.1; affected X15.0.2; affected X15.0.3; affected X14.3.6; affected X15.2.0; affected X15.2.1; affected X15.2.2; affected X15.2.3; affected X14.3.7; affected X15.2.4.; affected X15.2.4; affected X15.3.0; affected X15.3.1; affected X15.3.2; affected X15.4.0; affected X15.5.0; affected X15.5.1; affected X15.5.2

Vendor / product

Versions

Cisco / Cisco TelePresence Video Communication Server (VCS) Expressway

affected X8.11.2; affected X8.6; affected X8.11.3; affected X8.2.2; affected X8.8.3; affected X8.11.0; affected X12.5.2; affected X8.1.1; affected X8.9; affected X12.5.1; affected X12.5.6; affected X8.7.3; affected X12.6.0; affected X8.11.1; affected X8.5; affected X8.9.1; affected X8.10.2; affected X8.8.2; affected X8.5.3; affected X8.1; affected X8.9.2; affected X8.11.4; affected X12.5.4; affected X8.8.1; affected X8.2.1; affected X8.5.1; affected X8.6.1; affected X8.1.2; affected X8.8; affected X8.10.0; affected X12.5.3; affected X8.10.1; affected X12.5.7; affected X8.10.3; affected X8.7.1; affected X8.2; affected X12.5.8; affected X8.7; affected X8.5.2; affected X12.5.9; affected X12.5.0; affected X8.10.4; affected X8.7.2; affected X12.5.5; affected X12.6.1; affected X12.6.2; affected X12.6.3; affected X12.6.4; affected X12.7.0; affected X12.7.1; affected X14.0.0; affected X14.0.1; affected X14.0.2; affected X14.0.3; affected X14.0.4; affected X14.0.5; affected X14.0.6; affected X14.0.7; affected X14.0.8; affected X14.2.0; affected X14.0.9; affected X14.2.1; affected X14.2.2; affected X14.0.11; affected X14.2.5; affected X14.0.10; affected X14.2.6; affected X14.2.7; affected X14.3.0; affected X14.3.1; affected X14.3.2; affected X14.3.3; affected X15.0.0; affected X14.3.4; affected X14.3.5; affected X15.0.1; affected X15.0.2; affected X15.0.3; affected X14.3.6; affected X15.2.0; affected X15.2.1; affected X15.2.2; affected X15.2.3; affected X14.3.7; affected X15.2.4.; affected X15.2.4; affected X15.3.0; affected X15.3.1; affected X15.3.2; affected X15.4.0; affected X15.5.0; affected X15.5.1; affected X15.5.2

CWE

CWE-787

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.