# CVE-2026-110261: OW2 ASM 3.0 before 9.11 Excessive CPU Consumption via ClassWriter COMPUTE_FRAMES

> Attackers can cause excessive CPU consumption and denial of service by supplying crafted class files to the OW2 ASM library's ClassWriter COMPUTE_FRAMES feature.

- **Severity:** Medium 6.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 14 Oct 2026
- **Updated:** 14 Oct 2026
- **Also known as:** AZL-108366, AZL-108411, DEBIAN-CVE-2026-110261, GHSA-42q2-x6j4-w994, UBUNTU-CVE-2026-110261

## What is CVE-2026-110261?

CVE-2026-110261 is a medium-severity denial of service vulnerability in OW2 ASM, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

OW2 ASM 3.0 before 9.11 contains a denial of service vulnerability that allows attackers to exhaust CPU by supplying crafted class files processed with ClassWriter.COMPUTE_FRAMES. Attackers can craft methods that make the unbounded MethodWriter.computeAllFrames() fix point algorithm converge slowly, tying up transforming threads for unbounded time.

Weakness: CWE-407 (Inefficient Algorithmic Complexity)

## Which versions are affected by CVE-2026-110261?


## How do I fix CVE-2026-110261?

Upgrade to a fixed version.

## Is CVE-2026-110261 being exploited?

There is no known exploitation of CVE-2026-110261 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-110261 and fix it if it is affected.

What it is: CVE-2026-110261 is a medium-severity denial of service vulnerability in OW2 ASM, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-110261 in the wild and no public exploit code.

Affected product: OW2 ASM. 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-2026-110261/ (Markdown: https://insights.sbomify.com/CVE-2026-110261/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-110261
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-110261
- OSV: https://osv.dev/vulnerability/CVE-2026-110261

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-110261/
Summaries are generated and may contain mistakes; the official description above is the record.