CVE-2026-31931 Suricata tls: null dereference in tls.alpn rule keyword
A null pointer dereference in Suricata's tls.alpn rule keyword allows attackers to crash the service, requiring specific rule configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31931?
CVE-2026-31931 is a high-severity vulnerability in Oisf Suricata, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Suricata is a network IDS, IPS and NSM engine. From version 8.0.0 to before version 8.0.4, use of the "tls.alpn" rule keyword can cause Suricata to crash with a NULL dereference. This issue has been patched in version 8.0.4.
Weakness: CWE-476
Which versions are affected by CVE-2026-31931?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-31931?
Upgrade to a fixed version.
Is CVE-2026-31931 being exploited?
There is no known exploitation of CVE-2026-31931 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-31931, GHSA-gr22-4784-xvw3, UBUNTU-CVE-2026-31931.