CVE-2026-20356 Multiple Cisco Products Snort 3 Software Hardening Release: October 2026
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-20356?
CVE-2026-20356 is a high-severity vulnerability in Cisco Cyber Vision, published on 21 Oct 2026.
Official description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 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-2026-20356 are related to issues concerning uncontrolled resource consumption that are grouped under the Common Weakness Enumeration (CWE) Base CWE-400.
Weakness: CWE-400
Which versions are affected by CVE-2026-20356?
How do I fix CVE-2026-20356?
No fix has been published for CVE-2026-20356 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20356 being exploited?
There is no known exploitation of CVE-2026-20356 in the wild and no public exploit code.
Sources
Also known as GHSA-6f29-xvj6-835h.