CVE-2026-45761: CWE-122: Heap-based Buffer Overflow in OISF suricata
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.
AI Analysis
Technical Summary
Suricata versions before 7.0.16 and 8.0.5 contain a heap-based buffer overflow vulnerability (CWE-122) triggered by loading crafted rules with mixed-case frame syntax. The vulnerability manifests during rule parsing/loading, not from network traffic. This can cause a denial of service by crashing Suricata. The issue is fixed in versions 7.0.16 and 8.0.5. Workarounds include preprocessing rules to enforce lowercase frames or restricting to trusted rulesets.
Potential Impact
The vulnerability can cause Suricata to crash (denial of service) when processing maliciously crafted rules with mixed-case frame syntax. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
Apply the official fixes by upgrading Suricata to version 7.0.16 or later, or 8.0.5 or later. As a temporary workaround, preprocess rules to ensure all frames are lowercase and/or only load trusted rulesets. This vulnerability is fixed in the stated versions.
CVE-2026-45761: CWE-122: Heap-based Buffer Overflow in OISF suricata
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.
CVSS v3.1
Score 3.3low
Affected software
OISF
suricata
pkg:github/oisf/suricataRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Suricata versions before 7.0.16 and 8.0.5 contain a heap-based buffer overflow vulnerability (CWE-122) triggered by loading crafted rules with mixed-case frame syntax. The vulnerability manifests during rule parsing/loading, not from network traffic. This can cause a denial of service by crashing Suricata. The issue is fixed in versions 7.0.16 and 8.0.5. Workarounds include preprocessing rules to enforce lowercase frames or restricting to trusted rulesets.
Potential Impact
The vulnerability can cause Suricata to crash (denial of service) when processing maliciously crafted rules with mixed-case frame syntax. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
Apply the official fixes by upgrading Suricata to version 7.0.16 or later, or 8.0.5 or later. As a temporary workaround, preprocess rules to ensure all frames are lowercase and/or only load trusted rulesets. This vulnerability is fixed in the stated versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T07:45:21.250Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa31e6991cc7f3848be407d
Added to database: 09/10/2026, 21:17:29 UTC
Last enriched: 09/10/2026, 21:32:27 UTC
Last updated: 09/10/2026, 22:12:31 UTC
Views: 6
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