CVE-2026-110258 OW2 ASM 3.0 before 9.11 Excessive Memory Allocation via Multiple RET Instructions
Attackers can crash the JVM by supplying a crafted class file with multiple RET instructions, causing excessive memory allocation in the OW2 ASM library.
- 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-2026-110258?
CVE-2026-110258 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 excessive memory allocation vulnerability in Label.addSubroutineRetSuccessors() that fails to enforce the single-RET-per-JSR rule. Attackers can supply a crafted invalid class file with multiple RET instructions for one JSR, triggering a roughly 2 GB allocation that crashes the JVM.
Weakness: CWE-789
Which versions are affected by CVE-2026-110258?
How do I fix CVE-2026-110258?
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-2026-110258 being exploited?
There is no known exploitation of CVE-2026-110258 in the wild and no public exploit code.
Sources
Also known as AZL-108384, AZL-108420, DEBIAN-CVE-2026-110258, GHSA-mx28-xgjx-vqcw, UBUNTU-CVE-2026-110258.