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.
- 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
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
Which versions are affected by CVE-2026-110261?
How do I fix CVE-2026-110261?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-110261 being exploited?
There is no known exploitation of CVE-2026-110261 in the wild and no public exploit code.
Sources
Also known as AZL-108366, AZL-108411, DEBIAN-CVE-2026-110261, GHSA-42q2-x6j4-w994, UBUNTU-CVE-2026-110261.