CVE-2026-72757 Routinator HTTP server becomes unavailable with many unclosed connections
Medium 5.3
Published
Updated
Check this codebase for CVE-2026-72757 and fix it if it is affected.
What it is: CVE-2026-72757 is a medium-severity vulnerability in NLnet Labs Routinator, published on 26 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-72757 in the wild and no public exploit code.
Affected product: NLnet Labs Routinator. 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-2026-72757/ (Markdown: https://insights.sbomify.com/CVE-2026-72757/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-72757?
CVE-2026-72757 is a medium-severity vulnerability in NLnet Labs Routinator, published on 26 Oct 2026.
Official description
Routinator runs out of open connections on the HTTP server when many connections are opened but never closed, leaving the HTTP server unavailable. This condition can be triggered maliciously by an attacker by opening a large number of connections to the HTTP server.
This only affects users that make their HTTP or RTR server available to untrusted networks.
Weakness: CWE-755
Which versions are affected by CVE-2026-72757?
How do I fix CVE-2026-72757?
No fix has been published for CVE-2026-72757 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-72757 being exploited?
There is no known exploitation of CVE-2026-72757 in the wild and no public exploit code.
Sources
Also known as GHSA-qfwm-769m-74fg.