# 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.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Nov 2025
- **Updated:** 28 Nov 2025
- **Also known as:** DEBIAN-CVE-2025-64333, GHSA-537h-xxmx-v87m, UBUNTU-CVE-2025-64333

## 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.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2025-64333?

It affects 1 product.


Products: Oisf Suricata.

## How do I fix CVE-2025-64333?

Upgrade to a fixed version.

## 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

- [CVE-2023-35853](https://insights.sbomify.com/CVE-2023-35853/): Code injection in n/a (critical 9.8)
- [CVE-2021-37592](https://insights.sbomify.com/CVE-2021-37592/): Other in n/a (critical 9.8)
- [CVE-2018-10244](https://insights.sbomify.com/CVE-2018-10244/): Integer overflow in n/a (critical 9.8)
- [CVE-2026-94083](https://insights.sbomify.com/CVE-2026-94083/): Memory corruption in Suricata (critical 9.4)
- [CVE-2026-94084](https://insights.sbomify.com/CVE-2026-94084/): Use after free in Suricata (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-64333 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2025-64333 in the wild and no public exploit code.

Affected product: Oisf Suricata. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-64333/ (Markdown: https://insights.sbomify.com/CVE-2025-64333/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-64333
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-64333
- OSV: https://osv.dev/vulnerability/CVE-2025-64333

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-64333/
Summaries are generated and may contain mistakes; the official description above is the record.