CVE-2026-22263 Suricata http1: quadratic complexity in headers parsing over multiple packets
Attackers can cause service slowdown in Suricata by sending multiple packets, exploiting quadratic complexity in HTTP header parsing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-22263?
CVE-2026-22263 is a medium-severity denial of service vulnerability in Oisf Suricata, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Suricata is a network IDS, IPS and NSM engine. Starting in version 8.0.0 and prior to version 8.0.3, inefficiency in http1 headers parsing can lead to slowdown over multiple packets. Version 8.0.3 patches the issue. No known workarounds are available.
Weakness: CWE-1050
Which versions are affected by CVE-2026-22263?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-22263?
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-2026-22263 being exploited?
There is no known exploitation of CVE-2026-22263 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-22263, GHSA-rwc5-hxj6-hwx7, UBUNTU-CVE-2026-22263.