CVE-2026-88351

9.8 CRITICALpublic exploit available

Published 2026-09-24 · Updated 2026-09-25

AI risk analysis

Summary: The flaw is an integer overflow vulnerability in the MPack Node API that can lead to heap-buffer-overflow, memory corruption, and denial of service. This matters because it can be exploited to crash the application or gain control over the system.
Exploitability: Exploitation is moderately hard as it requires crafting a specially crafted MessagePack array32 or map32 object with an excessively large element count. The attacker must have the ability to send such a payload to the affected application.
Blast radius: If exploited, the vulnerability could result in a denial of service for the affected application, potentially impacting availability and reliability of the service.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to MPack 1.1.2 or later.

heap-overflowdenial-of-serviceapi-vulnerability

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

An integer overflow vulnerability exists in the MPack Node API in MPack 1.1.1 on 32-bit platforms. When parsing a specially crafted MessagePack array32 or map32 object with an excessively large element count, the page allocation size calculation in mpack_tree_parse_children() can overflow size_t and produce an undersized allocation. Subsequent parsing writes mpack_node_data_t records beyond the allocated heap buffer, resulting in heap-buffer-overflow, memory corruption, and denial of service.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-190

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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