CVE-2026-110257
OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute
CVSS Score
5.5
EPSS Score
0.0%
EPSS Percentile
0th
OW2 ASM 5.0 before 9.11 contains an excessive memory allocation vulnerability in ClassReader.readBootstrapMethodsAttribute() that sizes an int array from num_bootstrap_methods without validating attribute_length. Attackers can supply a crafted class file of about 100 bytes that forces roughly 2 GB allocation, causing an OutOfMemoryError that crashes the JVM or consuming thread.
| CWE | CWE-789 |
| Vendor | ow2 |
| Product | asm |
| Published | Oct 14, 2026 |
| Last Updated | Oct 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
OW2 / ASM
5.0 < 9.11
References
gitlab.ow2.org: https://gitlab.ow2.org/asm/asm/-/merge_requests/456 gitlab.ow2.org: https://gitlab.ow2.org/asm/asm/-/commit/eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967c gitlab.ow2.org: https://gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/ClassReader.java#L3497 asm.ow2.io: https://asm.ow2.io/versions.html vulncheck.com: https://www.vulncheck.com/advisories/ow2-asm-5.0-before-9.11-excessive-memory-allocation-via-bootstrapmethods-attribute
Credits
Yu Bao, PayPal Cyber Security Team