CVE-2026-45768

Suricata ldap: unbounded responses per transaction can lead to resource exhaustion

High7.5EPSS 0.70%

Published: 10 Sept 2026
Updated: 11 Sept 2026
Reserved: 13 May 2026
Assigned by: GitHub_M

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;)`.

Scores

CVSS scores of CVE-2026-45768, by who scored it
Scored by	CVSS	Score	Vector
GitHub_MCNA (assigner)	3.1	High7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Analyzed	3.1	High7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS (exploitation in 30 days): 0.70% · top 47% of all CVEs (6 Nov 2026)
CISA SSVC: Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

OISF · suricata
- affected >= 8.0.0, < 8.0.5

References (3)

https://github.com/OISF/suricata/security/advisories/GHSA-cr4x-w4c4-57p7 (opens in a new tab)x_refsource_CONFIRM
https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 (opens in a new tab)x_refsource_MISC
https://redmine.openinfosecfoundation.org/issues/8405 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated 11 Sept 2026, 20:31 UTC.