Vulnerability in Ow2 Asm
CVE-2026-110259
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- gitlab.ow2.org/asm/asm/-/merge_requests/459 (patch)
- gitlab.ow2.org/asm/asm/-/commit/e9aca627c17e1619bcb8059afb43382dac6b275f (patch)
- gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/Cl… (technical-description)
- asm.ow2.io/versions.html (release-notes)
- www.vulncheck.com/advisories/ow2-asm-3.0-before-9.11-uncontrolled-recursion-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110259?
- CVE-2026-110259 is a medium-severity vulnerability in Ow2 Asm, classified under Uncontrolled Recursion. CVSS score: 5.5/10. Published 2026-10-14.
- How severe is CVE-2026-110259?
- Medium severity. CVSS v3 base score is 5.5 out of 10.