CVE-2026-45769 ikev2: unbounded client transform storage can lead to resource exhaustion
Attackers can cause Suricata to consume excessive memory via crafted IKEv2 traffic, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45769?
CVE-2026-45769 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,IKEv2 parser state could grow without bounds while storing client transforms. Repeated crafted UDP traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service. Versions 7.0.16 and 8.0.5 fix the issue. Some workarounds are available. Disable IKE application-layer parsing if it is not needed. Alternatively, use a rule to bypass ike flows after the first packets like `alert ike any any -> any any (sid: 2; flow.pkts_toserver: > 256; bypass; noalert;)`.
Which versions are affected by CVE-2026-45769?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-45769?
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-2026-45769 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45769 exists.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-45769, GHSA-hg2g-r464-5593, UBUNTU-CVE-2026-45769.