CVE-2026-63452 Suricata http1: repeated brotli compression bombs can cause excessive CPU consumption
Attackers can cause denial of service in Suricata by sending repeated brotli compression bombs, degrading packet processing and monitoring visibility.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63452?
CVE-2026-63452 is a high-severity denial of service vulnerability in Oisf Suricata, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-63452?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-63452?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-63452 being exploited?
There is no known exploitation of CVE-2026-63452 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-63452, GHSA-j9cx-w9xm-5x84, UBUNTU-CVE-2026-63452.