Vulnerability · Published Sep 10, 2026 · Assigned by GitHub_M
CVE-2026-45768Suricata ldap: unbounded responses per transaction can lead to resource exhaustion
High 7.5
In plain English
A high-severity uncontrolled resource consumption in suricata from OISF. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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;)`.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | suricata | no fix listed | DEBIAN-CVE-2026-45768 |
| Debian:14 | suricata | 1:8.0.5-1 | DEBIAN-CVE-2026-45768 |
| Ubuntu:22.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-45768 |
| Ubuntu:24.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-45768 |
| Ubuntu:26.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-45768 |
Affected products (as reported)
Weakness: CWE-400, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/OISF/suricata/security/advisories/GHSA-cr4x-w4c4-57p7 x_refsource_CONFIRM
- https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 x_refsource_MISC
- https://redmine.openinfosecfoundation.org/issues/8405 x_refsource_MISC