CVE-2026-110257: Memory Allocation with Excessive Size Value in OW2 ASM
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.
CVSS v4.0
Score 6.8medium
Affected software
OW2
ASM
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in OW2 ASM 5.0 before 9.11 arises from improper validation of attribute_length in ClassReader.readBootstrapMethodsAttribute(). Attackers can craft a class file that triggers allocation of an int array sized by num_bootstrap_methods without bounds checking, resulting in excessive memory allocation (~2 GB). This causes an OutOfMemoryError, potentially crashing the JVM or the thread processing the class file. The flaw is due to missing validation of attribute_length before array sizing.
Potential Impact
Exploitation of this vulnerability can cause denial of service by crashing the Java Virtual Machine or the thread handling the malicious class file due to an OutOfMemoryError. There is no indication of privilege escalation or code execution. The impact is limited to resource exhaustion leading to service disruption.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted or malformed class files with vulnerable versions of OW2 ASM.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-13T18:33:55.549Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acf92e72cdf04f6568a2401
Added to database: 10/14/2026, 14:34:15 UTC
Last enriched: 10/14/2026, 15:33:15 UTC
Last updated: 10/14/2026, 19:00:32 UTC
Views: 1
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