# CVE-2026-54716: Valhalla: Degenerate exclude_polygons (collinear points, zero area) causes OOM in /sources_to_targets

> An unauthenticated attacker can cause a denial of service in Valhalla by sending a POST request with degenerate exclude_polygons, triggering unbounded memory growth.

- **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:** No
- **Published:** 17 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-qpf6-xp29-pg6r

## What is CVE-2026-54716?

CVE-2026-54716 is a high-severity denial of service vulnerability in valhalla, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Valhalla is an open source routing engine and accompanying libraries for use with OpenStreetMap data. In 3.7.0 and earlier, a POST request to /sources_to_targets containing an exclude_polygons ring formed by three collinear points can cause unbounded memory growth in the worker. The zero-area geometry, rather than the other request options, triggers processing in src/loki/polygon_search.cc until the process is terminated by the out-of-memory killer. A single unauthenticated request can therefore stop a public-facing worker. Other endpoints that accept exclude_polygons, including /route, were not verified as affected. No fixed version is available as of this review.

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

## Which versions are affected by CVE-2026-54716?


## How do I fix CVE-2026-54716?

No fix has been published for CVE-2026-54716 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-54716 being exploited?

There is no known exploitation of CVE-2026-54716 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54716 and fix it if it is affected.

What it is: CVE-2026-54716 is a high-severity denial of service vulnerability in valhalla, published on 17 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-2026-54716 in the wild and no public exploit code.

Affected product: valhalla. 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-2026-54716/ (Markdown: https://insights.sbomify.com/CVE-2026-54716/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54716
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54716
- OSV: https://osv.dev/vulnerability/CVE-2026-54716

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54716/
Summaries are generated and may contain mistakes; the official description above is the record.