CVE-2026-45768 Suricata ldap: unbounded responses per transaction can lead to resource exhaustion
Crafted LDAP traffic over UDP can cause Suricata to consume excessive memory, 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-2026-45768?
CVE-2026-45768 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. Starting in version 8.0.0 and prior to version 8.0.5, LDAP transaction state could store an unbounded number of responses. Because LDAP can be processed over UDP, crafted traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service. Version 8.0.5 contains a fix. As a workaround, disable LDAP application-layer parsing where it is not required. Alternatively, use a rule like `alert ldap any any -> any any (sid: 1; ldap.responses.count: >1024; bypass;)`.
Which versions are affected by CVE-2026-45768?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-45768?
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-2026-45768 being exploited?
There is no known exploitation of CVE-2026-45768 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-45768, GHSA-cr4x-w4c4-57p7, UBUNTU-CVE-2026-45768.