Critical severity · published Sep 10, 2026
CVE-2026-45764
Suricata http2: protocol-change type confusion can lead to denial of service
9.1
CVSS
0.6%
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 protocol change while processing HTTP/2 traffic could lead to type confusion in Suricata. Crafted traffic may cause Suricata to crash, resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable HTTP/2 parsing if it is not required.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% 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-2026-45764
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45764
Release Notes
https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315
Third Party Advisory
https://github.com/OISF/suricata/security/advisories/GHSA-5rvq-72r5-rqhr
Permissions Required
https://redmine.openinfosecfoundation.org/issues/8492
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