CVE-2026-20218 A vulnerability in the Snort 3 Visual Basic for Applications (VBA) Decompression Engine of multiple Cisco products could allow an unauthenti
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-20218?
CVE-2026-20218 is a medium-severity vulnerability in Cisco Open Source Snort3, published on 21 Oct 2026.
Official description
A vulnerability in the Snort 3 Visual Basic for Applications (VBA) Decompression Engine of multiple Cisco products could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper range checking when Snort 3 decompresses VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine of a targeted device. A successful exploit could allow the attacker to cause an overflow of stack data, which could result in a DoS condition.
Weakness: CWE-121
Which versions are affected by CVE-2026-20218?
How do I fix CVE-2026-20218?
No fix has been published for CVE-2026-20218 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20218 being exploited?
There is no known exploitation of CVE-2026-20218 in the wild and no public exploit code.
Sources
Also known as GHSA-vvhg-cxrm-qp98.