High severity · published Sep 18, 2026
CVE-2026-63452
Suricata http1: repeated brotli compression bombs can cause excessive CPU consumption
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, the HTTP/1 parser limits decompression work per transaction but does not limit how many small brotli compression bombs a single flow can submit. With response-body-decompress-layer-limit enabled, repeated compressed responses make the decompression paths in rust/htp perform expensive work for every transaction, degrading packet processing and potentially causing loss of monitoring visibility or denial of service. This issue is fixed in version 8.0.6.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
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, < 8.0.6 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63452
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63452
Patch
https://github.com/OISF/suricata/commit/392b6aee2971a4b5e573850f5d832112509bcb5f
Patch
https://github.com/OISF/suricata/commit/e369bf29ee5bbd0cdf6a98dc4a3357ba43c86a88
Release Notes
https://github.com/OISF/suricata/releases/tag/suricata-8.0.6
Mitigation
https://github.com/OISF/suricata/security/advisories/GHSA-j9cx-w9xm-5x84
Permissions Required
https://redmine.openinfosecfoundation.org/issues/8694
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