CVE-2026-20268 Cisco IOS XE Software Security Hardening Release

High 8.6 Published 5 Aug 2026 Updated 2 Oct 2026

Cisco IOS XE contains memory buffer restriction flaws that could allow attackers to execute arbitrary code or cause denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-20268?

CVE-2026-20268 is a high-severity memory corruption vulnerability in Cisco Ios Xe, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE 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-2026-20268 are related to issues with improper restriction of operations within the bounds of a memory buffer that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-119.

Weakness: CWE-119

Which versions are affected by CVE-2026-20268?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2026-20268?

No fix has been published for CVE-2026-20268 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-20268 being exploited?

There is no known exploitation of CVE-2026-20268 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-3vcg-p7rg-2799.