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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.

Open Information Security Foundation Suricata是Open Information Security Foundation组织的一款实时分析网络流量并检测和防御网络入侵的安全引擎。 Open Information Security Foundation Suricata 7.0.16之前版本和8.0.5之前版本存在缓冲区错误漏洞，该漏洞源于加载签名时使用大小写混合frame语法的特制规则，可能导致堆缓冲区溢出。

CVSS 3.3 · Low EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
OISF suricata >= 8.0.0, < 8.0.5 affected
< 7.0.16 affected
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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
Vulnerability Title
Open Information Security Foundation Suricata 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open Information Security Foundation Suricata是Open Information Security Foundation组织的一款实时分析网络流量并检测和防御网络入侵的安全引擎。 Open Information Security Foundation Suricata 7.0.16之前版本和8.0.5之前版本存在缓冲区错误漏洞，该漏洞源于加载签名时使用大小写混合frame语法的特制规则，可能导致堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OISF suricata >= 8.0.0, < 8.0.5 -

II. Public POCs for CVE-2026-45761

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III. Intelligence Information for CVE-2026-45761

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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)

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
Same vendor: OISF
Same weakness: CWE-122