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Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck

CVE-2026-110259OW2 ASM 3.0 before 9.11 Uncontrolled Recursion via ClassWriter.replaceAsmInstructions()

Medium 5.5

In plain English

A medium-severity security flaw in ASM from OW2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 93.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12asmno fix listedDEBIAN-CVE-2026-110259
Debian:13asmno fix listedDEBIAN-CVE-2026-110259
Debian:14asm9.11.1-1DEBIAN-CVE-2026-110259
Ubuntu:22.04:LTSasmno fix listedUBUNTU-CVE-2026-110259
Ubuntu:24.04:LTSasmno fix listedUBUNTU-CVE-2026-110259
Ubuntu:26.04:LTSasmno fix listedUBUNTU-CVE-2026-110259
Ubuntu:26.10asmno fix listedUBUNTU-CVE-2026-110259

Affected products (as reported)

VendorProductVersions
OW2 ASM 3.0 – before 9.11

Weakness: CWE-674 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References