CVE-2026-45759 Suricata http1: quadratic Content-Disposition processing can lead to denial of service
Crafted HTTP traffic causes excessive CPU usage in Suricata, leading to denial of service; administrators should upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45759?
CVE-2026-45759 is a high-severity denial of service vulnerability in Oisf Suricata, published on 10 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. Prior to versions 7.0.16 and 8.0.5, Suricata could repeatedly perform expensive parsing of large HTTP `Content-Disposition` headers during HTTP response body processing. Crafted HTTP traffic could cause excessive CPU usage and denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, use a rule like `alert http1 any any -> any any (sid: 1; http.request_header; content: "Content-Disposition:"; startswith; bsize: > 8192; bypass;)`.
Weakness: CWE-400
Which versions are affected by CVE-2026-45759?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-45759?
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-2026-45759 being exploited?
There is no known exploitation of CVE-2026-45759 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-45759, GHSA-cfq5-g2v5-6652, UBUNTU-CVE-2026-45759.