# CVE-2026-94083: Memory corruption in Suricata

> An attacker can cause a denial of service in Suricata via a type confusion in DoH2 handling that leads to an invalid free.

- **Severity:** Critical 9.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 20 Sep 2026
- **Updated:** 22 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-94083, GHSA-4wwf-734g-mqm8, UBUNTU-CVE-2026-94083

## What is CVE-2026-94083?

CVE-2026-94083 is a critical memory corruption vulnerability in Oisf Suricata, published on 20 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup code for the HTTP2 state is executed even though the actual state is HTTP1 (when there is a DoH2 request with an HTTP1 to HTTP2 upgrade). This requires app-layer.protocols.doh2 to be enabled, which is the default in 8.x versions.

Weakness: CWE-843 (Access of Resource Using Incompatible Type)

## Which versions are affected by CVE-2026-94083?

It affects 1 product.


Products: Oisf Suricata.

## How do I fix CVE-2026-94083?

Upgrade to a fixed version.

## Is CVE-2026-94083 being exploited?

There is no known exploitation of CVE-2026-94083 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-2026-94084](https://insights.sbomify.com/CVE-2026-94084/): Use after free in Suricata (critical 9.4)
- [CVE-2026-45764](https://insights.sbomify.com/CVE-2026-45764/): Suricata http2: protocol-change type confusion can lead to denial of service (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-94083 and fix it if it is affected.

What it is: CVE-2026-94083 is a critical memory corruption vulnerability in Oisf Suricata, published on 20 Sep 2026. 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-2026-94083 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-2026-94083/ (Markdown: https://insights.sbomify.com/CVE-2026-94083/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-94083
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-94083
- OSV: https://osv.dev/vulnerability/CVE-2026-94083

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-94083/
Summaries are generated and may contain mistakes; the official description above is the record.