CVE-2026-45765 Suricata dnp3: unbounded reassembly can lead to resource exhaustion
Crafted DNP3 traffic can cause Suricata to consume excessive memory, leading to denial of service when DNP3 is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45765?
CVE-2026-45765 is a high-severity denial of service 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, DNP3 reassembly could buffer data without sufficient parser-level bounds. Crafted DNP3 traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable DNP3 (which is not enabled by default) if it is not needed, and/or define a limited `stream.reassembly.depth` (0 or absent is unlimited).
Which versions are affected by CVE-2026-45765?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-45765?
Upgrade to a fixed version.
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-2026-45765 being exploited?
There is no known exploitation of CVE-2026-45765 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-45765, GHSA-m8x4-c78g-r4vj, UBUNTU-CVE-2026-45765.