# CVE-2026-93579: Io.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)

> Remote attackers can inject prohibited characters into HTTP/2 headers, enabling request smuggling and response splitting via translation boundaries.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 18 Sep 2026
- **Updated:** 16 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-93579, GHSA-6w3j-2wqp-7r38, UBUNTU-CVE-2026-93579

## What is CVE-2026-93579?

CVE-2026-93579 is a medium-severity vulnerability in Red Hat AMQ Broker 7, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. This could lead to unauthorized access, data manipulation, or other security bypasses.

Weakness: CWE-1035

## Which versions are affected by CVE-2026-93579?


## How do I fix CVE-2026-93579?

Upgrade to a fixed version.

## Is CVE-2026-93579 being exploited?

There is no known exploitation of CVE-2026-93579 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93579 and fix it if it is affected.

What it is: CVE-2026-93579 is a medium-severity vulnerability in Red Hat AMQ Broker 7, published on 18 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-2026-93579 in the wild and no public exploit code.

Affected product: Red Hat AMQ Broker 7. 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-2026-93579/ (Markdown: https://insights.sbomify.com/CVE-2026-93579/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93579
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93579
- OSV: https://osv.dev/vulnerability/CVE-2026-93579

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93579/
Summaries are generated and may contain mistakes; the official description above is the record.