CVE-2026-110257
OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute
- State
- Published
- Severity
- 6.8 Medium
- Published
- Oct 14, 2026
- Updated
- Oct 14, 2026
- Reserved
- Oct 13, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.8 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.5 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-789 Memory Allocation with Excessive Size Value
Affected Products
| Product | Versions |
|---|---|
ASMOW2 |
|
References
- https://gitlab.ow2.org/asm/asm/-/merge_requests/456patch
- https://gitlab.ow2.org/asm/asm/-/commit/eb5fa95bb0670eaec2ecf9b8a3a501b48e5a967cpatch
- https://gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/ClassReader.java#L3497technical-description
- ASM 9.11 Release Notesrelease-notes
- VulnCheck Advisory: OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attributethird-party-advisory
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