CVE-2026-45761 Suricata detect: case-insensitive frame handling can cause heap buffer overflow during rule load
A heap buffer overflow in Suricata's rule parser allows attackers to execute code or cause denial of service by loading crafted rules with mixed-case frame syntax.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45761?
CVE-2026-45761 is a low-severity memory corruption vulnerability in Oisf Suricata, published on 10 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, a crafted rule using mixed-case frame syntax could trigger a heap buffer overflow while Suricata is loading signatures. The issue is reached during rule parsing/loading rather than by network traffic alone. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, preprocess rules to check that frames are all lowercase and/or only load trusted rulesets.
Weakness: CWE-122
Which versions are affected by CVE-2026-45761?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-45761?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-45761 being exploited?
There is no known exploitation of CVE-2026-45761 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-45761, GHSA-r74x-74x5-r9vm, UBUNTU-CVE-2026-45761.