CVE-2025-64333 Suricata is vulnerable to a stack overflow from big content-type
A large HTTP content type can cause a stack overflow, crashing the Suricata network security engine.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-64333?
CVE-2025-64333 is a high-severity denial of service vulnerability in Oisf Suricata, published on 26 Nov 2025. 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 developed by the OISF (Open Information Security Foundation) and the Suricata community. Prior to versions 7.0.13 and 8.0.2, a large HTTP content type, when logged can cause a stack overflow crashing Suricata. This issue has been patched in versions 7.0.13 and 8.0.2. A workaround for this issue involves limiting stream.reassembly.depth to less then half the stack size. Increasing the process stack size makes it less likely the bug will trigger.
Which versions are affected by CVE-2025-64333?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2025-64333?
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-2025-64333 being exploited?
There is no known exploitation of CVE-2025-64333 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2025-64333, GHSA-537h-xxmx-v87m, UBUNTU-CVE-2025-64333.