CVE-2026-45761— Suricata detect: case-insensitive frame handling can cause heap buffer overflow during rule load
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）、入侵预防系统（IPS）及网络安全监控引擎。在 7.0.16 和 8.0.5 之前的版本中，使用混合大小写字母的帧语法规则可能触发堆缓冲区溢出。该问题发生在规则解析/加载阶段，而非仅由网络流量触发。7.0.16 和 8.0.5 版本中包含了修复。作为临时解决方案，建议对规则进行预检查，确保所有帧均使用小写字母，和/或仅加载可信的规则集。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-45761
Vulnerability Information
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Vulnerability Title
Suricata detect: case-insensitive frame handling can cause heap buffer overflow during rule load
Source: CVE Program / CVE List V5
Vulnerability 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, a crafted rule using mixed-case frame syntax could trigger a heap buffer overflow while Suricata is loading signatures. The issue is reached during rule parsing/loading rather than by network traffic alone. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, preprocess rules to check that frames are all lowercase and/or only load trusted rulesets.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-45761
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-45761 (1)
Vendor Pages for CVE-2026-45761 (1)
Other References for CVE-2026-45761 (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-2026-45768 | 7.5 HIGH | Suricata ldap: unbounded responses per transaction can lead to resource exhaustion |
| 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 |
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-2026-45768
Suricata ldap: unbounded responses per transaction can lead -
CVE-2026-45767
Suricata datasets: save to absolute filename can be bypassed -
CVE-2026-45766
Suricata nfs: unbounded stateful structures can lead to reso
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-2026-45768
Suricata ldap: unbounded responses per transaction can lead -
CVE-2026-45767
Suricata datasets: save to absolute filename can be bypassed -
CVE-2026-45766
Suricata nfs: unbounded stateful structures can lead to reso
Same weakness: CWE-122
V. Comments for CVE-2026-45761
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