CVE-2026-45768— Suricata ldap: unbounded responses per transaction can lead to resource exhaustion
Quick assessment
Affected
OISF suricata
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Suricata 是一款网络入侵检测系统（IDS）、入侵防御系统（IPS）以及网络安全监控引擎。从 8.0.0 版本开始至 8.0.5 之前的版本中，LDAP 事务状态可能存储无限数量的响应。由于 LDAP 可以通过 UDP 协议处理，构造的特制流量可能导致 Suricata 消耗过多内存，从而可能引发服务拒绝（DoS）。版本 8.0.5 包含对此问题的修复。作为临时解决方案，可以在不需要 LDAP 应用层解析的地方禁用 LDAP 解析。或者，使用类似以下规则的变通方法：
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I. Basic Information for CVE-2026-45768
Vulnerability Information
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Vulnerability Title
Suricata ldap: unbounded responses per transaction can lead to resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability 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;)`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-45768
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-45768 (1)
Vendor Pages for CVE-2026-45768 (1)
Other References for CVE-2026-45768 (1)
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🔗 Open Information Security Foundation x_refsource_MISC
Same Patch Batch · OISF · 2026-09-10 · 15 CVEs total
| CVE-2026-45764 | 9.1 CRITICAL | Suricata http2: protocol-change type confusion can lead to denial of service |
| CVE-2026-45747 | 7.5 HIGH | Suricata lua/tls: null dereference in TlsGetCertInfo |
| CVE-2026-46387 | 7.5 HIGH | Suricata http2: decompression bomb can cause denial of service in Suricata |
| CVE-2026-45759 | 7.5 HIGH | Suricata http1: quadratic Content-Disposition processing can lead to denial of service |
| CVE-2026-45762 | 7.5 HIGH | Suricata defrag: missing address-family check can lead to remote crash |
| CVE-2026-45769 | 7.5 HIGH | ikev2: unbounded client transform storage can lead to resource exhaustion |
| CVE-2026-45765 | 7.5 HIGH | Suricata dnp3: unbounded reassembly can lead to resource exhaustion |
| CVE-2026-45770 | 7.5 HIGH | Suricata lua: excessive flow variable registration can bypass sandbox |
| CVE-2026-45766 | 7.5 HIGH | Suricata nfs: unbounded stateful structures can lead to resource exhaustion |
| CVE-2026-45763 | 5.9 MEDIUM | Suricata lua: sandbox allocation limit not enforced for new allocations |
| CVE-2026-45751 | 5.9 MEDIUM | Suricata detect/transform: use-after-free in dotprefix transform |
| CVE-2026-45752 | 5.9 MEDIUM | Suricata detect/transform: use-after-free in decompress transforms |
| CVE-2026-45767 | 4.4 MEDIUM | Suricata datasets: save to absolute filename can be bypassed when combined with load comma |
| CVE-2026-45761 | 3.3 LOW | Suricata detect: case-insensitive frame handling can cause heap buffer overflow during rul |
IV. Related Vulnerabilities
Same product: suricata
-
CVE-2026-45770
Suricata lua: excessive flow variable registration can bypas -
CVE-2026-45769
ikev2: unbounded client transform storage can lead to resour -
CVE-2026-45767
Suricata datasets: save to absolute filename can be bypassed -
CVE-2026-45766
Suricata nfs: unbounded stateful structures can lead to reso -
CVE-2026-45765
Suricata dnp3: unbounded reassembly can lead to resource exh
Same vendor: OISF
-
CVE-2026-45770
Suricata lua: excessive flow variable registration can bypas -
CVE-2026-45769
ikev2: unbounded client transform storage can lead to resour -
CVE-2026-45767
Suricata datasets: save to absolute filename can be bypassed -
CVE-2026-45766
Suricata nfs: unbounded stateful structures can lead to reso -
CVE-2026-45765
Suricata dnp3: unbounded reassembly can lead to resource exh
Same weakness: CWE-400
-
CVE-2026-45769
ikev2: unbounded client transform storage can lead to resour -
CVE-2026-45766
Suricata nfs: unbounded stateful structures can lead to reso -
CVE-2026-45765
Suricata dnp3: unbounded reassembly can lead to resource exh -
CVE-2026-45759
Suricata http1: quadratic Content-Disposition processing can -
CVE-2026-87106
Consul vulnerable to a denial of service in the native RPC l
V. Comments for CVE-2026-45768
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