CVE-2026-110259 OW2 ASM 3.0 before 9.11 Uncontrolled Recursion via ClassWriter.replaceAsmInstructions()
Attackers can cause denial of service in applications using OW2 ASM by supplying crafted class files that trigger uncontrolled recursion.
- 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-2026-110259?
CVE-2026-110259 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 an uncontrolled recursion vulnerability in ClassWriter.replaceAsmInstructions() that allows attackers to cause denial of service through crafted class files. Attackers can supply a class with a large method containing many long forward jumps, triggering unbounded toByteArray() recursion and a StackOverflowError during transformation.
Weakness: CWE-674
Which versions are affected by CVE-2026-110259?
How do I fix CVE-2026-110259?
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-2026-110259 being exploited?
There is no known exploitation of CVE-2026-110259 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-110259, GHSA-g9hx-mj27-r452, UBUNTU-CVE-2026-110259.