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

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 3.0 至 9.11 版本（不含 9.11）在 方法中存在一个不受控制的递归漏洞。攻击者可以通过构造恶意类文件导致拒绝服务。具体而言，攻击者可提供一个包含大量长距离前向跳转的大方法，从而在类转换过程中触发无界的 递归调用，最终引发 StackOverflowError（栈溢出错误）。

CVSS 5.5 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
OW2 ASM 3.0< 9.11 affected
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I. Basic Information for CVE-2026-110259

Vulnerability Information
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Vulnerability Title
OW2 ASM 3.0 before 9.11 Uncontrolled Recursion via ClassWriter.replaceAsmInstructions()
Source: CVE Program / CVE List V5
Vulnerability 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.
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
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OW2 ASM 3.0 ~ 9.11 -

II. Public POCs for CVE-2026-110259

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III. Intelligence Information for CVE-2026-110259

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Other References for CVE-2026-110259 (4)

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

CVE-2026-110257 5.5 MEDIUM OW2 ASM 5.0 before 9.11 Excessive Memory Allocation via BootstrapMethods Attribute
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-674

V. Comments for CVE-2026-110259

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