# CVE-2026-92987: roxmltree through 0.21.1 Denial of Service via Quadratic Parsing

> Attackers can cause denial of service by crafting XML documents with excessive attributes, leading to quadratic CPU consumption in the roxmltree library.

- **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:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2026
- **Updated:** 24 Sep 2026
- **Also known as:** AZL-105209, GHSA-5fxw-8768-v85x, openSUSE-SU-2026:11841-1

## What is CVE-2026-92987?

CVE-2026-92987 is a high-severity denial of service vulnerability in RazrFalcon roxmltree, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

roxmltree through 0.21.1 performs quadratic-time attribute and namespace validation during XML parsing without limits on attribute count. Attackers can craft XML documents with tens of thousands of attributes on a single element to consume excessive CPU time and cause denial of service.

Weakness: CWE-407 (Inefficient Algorithmic Complexity)

## Which versions are affected by CVE-2026-92987?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `python-uv` | openSUSE:Tumbleweed | All versions | 0.12.17-1.1 |

## How do I fix CVE-2026-92987?

Upgrade to a fixed version.

## Is CVE-2026-92987 being exploited?

There is no known exploitation of CVE-2026-92987 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-92987 and fix it if it is affected.

What it is: CVE-2026-92987 is a high-severity denial of service vulnerability in RazrFalcon roxmltree, 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-2026-92987 in the wild and no public exploit code.

Affected product: RazrFalcon roxmltree. 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-2026-92987/ (Markdown: https://insights.sbomify.com/CVE-2026-92987/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-92987
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-92987
- OSV: https://osv.dev/vulnerability/CVE-2026-92987

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-92987/
Summaries are generated and may contain mistakes; the official description above is the record.