CVE-2025-64344 Suricata is vulnerable to a stack overflow from unbounded stack allocation in LuaPushStringBuffer
Attackers can cause a stack overflow in Suricata by triggering large buffer allocations in Lua scripts, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-64344?
CVE-2025-64344 is a high-severity memory corruption 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, working with large buffers in Lua scripts can lead to a stack overflow. Users of Lua rules and output scripts may be affected when working with large buffers. This includes a rule passing a large buffer to a Lua script. This issue has been patched in versions 7.0.13 and 8.0.2. A workaround for this issue involves disabling Lua rules and output scripts, or making sure limits, such as stream.depth.reassembly and HTTP response body limits (response-body-limit), are set to less than half the stack size.
Which versions are affected by CVE-2025-64344?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2025-64344?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-64344 being exploited?
There is no known exploitation of CVE-2025-64344 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2025-64344, GHSA-93fh-cgmc-w3rx, UBUNTU-CVE-2025-64344.