# CVE-2026-49234: Routinator crashes on specifically crafted ASN strings in the API

> Attackers can crash the Routinator RPKI server by sending malformed ASN strings to the API, affecting deployments with open API access.

- **Severity:** High 8.2 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Jun 2026
- **Updated:** 8 Jun 2026
- **Also known as:** GHSA-gc6q-cwcj-3vh9

## What is CVE-2026-49234?

CVE-2026-49234 is a high-severity denial of service vulnerability in NLnet Labs Routinator, published on 8 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

When sending a specifically crafted non-UTF-8 string as select-asn query parameter to the /api/v1/origins endpoint, Routinator crashes. 

This only affects users who allow API access from untrusted networks.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-49234?

2 open source packages ship an affected version, including routinator. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `routinator` | crates.io | All versions | 0.15.2 |
| `routinator` | crates.io | All versions | 0.15.2 |

Products: Nlnetlabs Routinator.

## How do I fix CVE-2026-49234?

Upgrade routinator to 0.15.2 or later.

## Is CVE-2026-49234 being exploited?

There is no known exploitation of CVE-2026-49234 in the wild and no public exploit code.

## Other vulnerabilities in NLnet Labs Routinator

- [CVE-2023-39916](https://insights.sbomify.com/CVE-2023-39916/): Possible path traversal when storing RRDP responses (critical 9.3)
- [CVE-2026-49235](https://insights.sbomify.com/CVE-2026-49235/): Routinator crashes on specifically crafted RRDP XML files (high 8.7)
- [CVE-2026-49233](https://insights.sbomify.com/CVE-2026-49233/): Routinator cache path traversal using rogue rsync URIs (high 8.3)
- [CVE-2023-39915](https://insights.sbomify.com/CVE-2023-39915/): Crashes on parsing certain invalid RPKI objects (high 7.5)
- [CVE-2022-3029](https://insights.sbomify.com/CVE-2022-3029/): Fatal error on incorrect base64 data in RRDP (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49234 and fix it if it is affected.

What it is: CVE-2026-49234 is a high-severity denial of service vulnerability in NLnet Labs Routinator, published on 8 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-49234 in the wild and no public exploit code.

Affected packages and fixed versions:
- routinator (crates.io): affected all versions; fixed in 0.15.2
- routinator (crates.io): affected all versions; fixed in 0.15.2

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-2026-49234/ (Markdown: https://insights.sbomify.com/CVE-2026-49234/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49234
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49234
- OSV: https://osv.dev/vulnerability/CVE-2026-49234

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-49234/
Summaries are generated and may contain mistakes; the official description above is the record.