Low severity · published Sep 10, 2026
CVE-2026-45761
Suricata detect: case-insensitive frame handling can cause heap buffer overflow during rule load
3.3
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SU
suricata · OISF
>= 8.0.0, < 8.0.5; < 7.0.16 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45761
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45761
Release Notes
https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315
Vendor Advisory
https://github.com/OISF/suricata/security/advisories/GHSA-r74x-74x5-r9vm
Permissions Required
https://redmine.openinfosecfoundation.org/issues/8526
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