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CVE-2026-110257— OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute

Quick assessment

Affected
OW2 ASM
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OW2 ASM 5.0 至 9.11 版本中， 方法存在过度内存分配漏洞。该漏洞中，代码根据 的值来分配整型数组的大小，但未对 进行有效性验证。攻击者可提供一个精心构造的、大小约 100 字节的类文件，从而强制 JVM 分配约 2 GB 的内存，导致 ，进而引发 JVM 崩溃或线程耗尽。

CVSS 5.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
OW2 ASM 5.0< 9.11 affected
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I. Basic Information for CVE-2026-110257

Vulnerability Information
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Vulnerability Title
OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OW2 ASM 5.0 ~ 9.11 -

II. Public POCs for CVE-2026-110257

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III. Intelligence Information for CVE-2026-110257

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Other References for CVE-2026-110257 (4)

Same Patch Batch · OW2 · 2026-10-14 · 9 CVEs total

CVE-2026-110259 5.5 MEDIUM OW2 ASM 3.0 before 9.11 Uncontrolled Recursion via ClassWriter.replaceAsmInstructions()
CVE-2026-110263 5.5 MEDIUM OW2 ASM 3.0 before 9.11 Uncontrolled Recursion in SignatureReader
CVE-2026-110260 5.5 MEDIUM OW2 ASM 3.0 before 9.11 Quadratic Memory Allocation via Exception Handlers
CVE-2026-110258 5.5 MEDIUM OW2 ASM 3.0 before 9.11 Excessive Memory Allocation via Multiple RET Instructions
CVE-2026-110270 5.5 MEDIUM OW2 ASM 3.0 before 9.11 Exponential Memory Allocation in JSRInlinerAdapter
CVE-2026-110591 5.5 MEDIUM OW2 ASM 1.4.3 before 9.11 Excessive Resource Consumption via Analyzer
CVE-2026-110261 5.5 MEDIUM OW2 ASM 3.0 before 9.11 Excessive CPU Consumption via ClassWriter COMPUTE_FRAMES
CVE-2026-110262 3.3 LOW OW2 ASM 3.1 before 9.11 Excessive Memory Allocation in AdviceAdapter

IV. Related Vulnerabilities

Same product: ASM
Same vendor: OW2
Same weakness: CWE-789

V. Comments for CVE-2026-110257

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