CVE-2026-71418
Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer. Multiple DATA frames with the EndOfStream flag set can grow the buffer to its 65 KiB limit while causing all prior contents to be processed again, producing quadratic CPU complexity, degraded packet processing, loss of monitoring visibility, or denial of service. This issue is fixed in version 8.0.6.
| CWE | CWE-407 |
| Vendor | oisf |
| Product | suricata |
| Published | Sep 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
OISF / suricata
>= 8.0.0, < 8.0.6
References
github.com: https://github.com/OISF/suricata/security/advisories/GHSA-xjgq-3qw4-jp5f github.com: https://github.com/OISF/suricata/commit/1731805967edf5d31448db2ae43cf72c6cf46c11 github.com: https://github.com/OISF/suricata/commit/26c26dea84f00de95151a0e16d21c1fcafac9648 github.com: https://github.com/OISF/suricata/releases/tag/suricata-8.0.6 redmine.openinfosecfoundation.org: https://redmine.openinfosecfoundation.org/issues/8725