CVE-2026-22259 Suricata dnp3: unbounded transaction growth
Crafted DNP3 traffic causes excessive memory consumption in Suricata, leading to process termination via OOM killer.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-22259?
CVE-2026-22259 is a high-severity denial of service vulnerability in Oisf Suricata, published on 27 Jan 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. Prior to versions 8.0.3 and 7.0.14, specially crafted traffic can cause Suricata to consume large amounts of memory while parsing DNP3 traffic. This can lead to the process slowing down and running out of memory, potentially leading to it getting killed by the OOM killer. Versions 8.0.3 or 7.0.14 contain a patch. As a workaround, disable the DNP3 parser in the suricata yaml (disabled by default).
Which versions are affected by CVE-2026-22259?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-22259?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-22259 being exploited?
There is no known exploitation of CVE-2026-22259 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-22259, GHSA-878h-2x6v-84q9, UBUNTU-CVE-2026-22259.