# CVE-2026-93488: Io.netty/netty-codec-http: netty: denial of service via unbounded concurrent spdy streams

> Remote attackers can cause denial of service in Netty by opening unlimited SPDY streams, leading to memory exhaustion and JVM crashes.

- **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:** 18 Sep 2026
- **Updated:** 15 Oct 2026
- **Also known as:** CLEANSTART-2026-FL88614, CLEANSTART-2026-ZG30727, DEBIAN-CVE-2026-93488, GHSA-mrqx-2r72-2c2x, UBUNTU-CVE-2026-93488

## What is CVE-2026-93488?

CVE-2026-93488 is a high-severity denial of service 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. SpdySessionHandler accepts an unlimited number of concurrent remote-initiated streams because localConcurrentStreams defaults to Integer.MAX_VALUE and the handler provides no API to change it. A remote peer can open a SPDY connection and send a large number of SYN_STREAM frames with FLAG_FIN=0, causing unbounded heap and direct memory allocation that can lead to JVM OutOfMemoryError and a denial of service.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2026-93488?


## How do I fix CVE-2026-93488?

Apply the vendor's patch.

## Is CVE-2026-93488 being exploited?

There is no known exploitation of CVE-2026-93488 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93488 and fix it if it is affected.

What it is: CVE-2026-93488 is a high-severity denial of service 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-2026-93488 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-2026-93488/ (Markdown: https://insights.sbomify.com/CVE-2026-93488/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93488
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93488
- OSV: https://osv.dev/vulnerability/CVE-2026-93488

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93488/
Summaries are generated and may contain mistakes; the official description above is the record.