CVE-2026-47874 Reactor Netty HTTP Server Denial of Service With Pipelined Requests
Medium 5.3
Published
Updated
Check this codebase for CVE-2026-47874 and fix it if it is affected.
What it is: CVE-2026-47874 is a medium-severity vulnerability in Spring Reactor Netty, published on 26 Aug 2026.
Exploitation: There is no known exploitation of CVE-2026-47874 in the wild and no public exploit code.
Affected product: Spring Reactor Netty. 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-2026-47874/ (Markdown: https://insights.sbomify.com/CVE-2026-47874/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-47874?
CVE-2026-47874 is a medium-severity vulnerability in Spring Reactor Netty, published on 26 Aug 2026.
Official description
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
Weakness: CWE-770
Which versions are affected by CVE-2026-47874?
It affects 1 product.
Products include Pivotal Reactor Netty.
How do I fix CVE-2026-47874?
Upgrade to a fixed version.
Is CVE-2026-47874 being exploited?
There is no known exploitation of CVE-2026-47874 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-DB50494, CLEANSTART-2026-KN48533, CLEANSTART-2026-NO71028, CLEANSTART-2026-YL03926, CLEANSTART-2026-YV14611, GHSA-fg4q-58fc-39w8.