CVE-2026-45751 Suricata detect/transform: use-after-free in dotprefix transform
A use-after-free in Suricata's dotprefix transform can cause crashes or potential code execution when processing specific network traffic with chained rules.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45751?
CVE-2026-45751 is a medium-severity use after free vulnerability in Oisf Suricata, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, 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, Suricata's inspection-buffer helper could leave an inspection pointer referencing freed memory after a chained transform caused the backing buffer to be reallocated. The issue is reached during a specific network traffic processing, and requires a specific but not malicious rule. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, avoid rules that chain `dotprefix` transform after another one.
Weakness: CWE-416
Which versions are affected by CVE-2026-45751?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-45751?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-45751 being exploited?
There is no known exploitation of CVE-2026-45751 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-45751, GHSA-59q6-j4w8-8pjx, UBUNTU-CVE-2026-45751.