# CVE-2026-49232: Routinator exits when accepting an incoming HTTP or RTR connection fails

> An attacker can cause Routinator to crash by exhausting file descriptors via excessive connections, affecting deployments exposing HTTP or RTR servers to untrusted networks.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Jun 2026
- **Updated:** 8 Jun 2026
- **Also known as:** GHSA-9vvr-6hrm-363j

## What is CVE-2026-49232?

CVE-2026-49232 is a high-severity denial of service vulnerability in NLnet Labs Routinator, published on 8 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Routinator exits on any error when accepting incoming HTTP or RTR connections, including ones it can recover from such as running out of file descriptors. This condition can be triggered maliciously by an attacker by opening a large number of connections to the HTTP or RTR server.

This only affects users that make their HTTP or RTR server available to untrusted networks.

Weakness: CWE-755 (Improper Handling of Exceptional Conditions)

## Which versions are affected by CVE-2026-49232?


## How do I fix CVE-2026-49232?

No fix has been published for CVE-2026-49232 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-49232 being exploited?

There is no known exploitation of CVE-2026-49232 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49232 and fix it if it is affected.

What it is: CVE-2026-49232 is a high-severity denial of service vulnerability in NLnet Labs Routinator, published on 8 Jun 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-2026-49232 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-2026-49232/ (Markdown: https://insights.sbomify.com/CVE-2026-49232/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49232
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49232
- OSV: https://osv.dev/vulnerability/CVE-2026-49232

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-49232/
Summaries are generated and may contain mistakes; the official description above is the record.