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CVE-2026-57585— MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error

Quick assessment

Affected
msgpack msgpack-python
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MessagePack是MessagePack组织开源的一个消息序列化格式。 MessagePack 1.2.1之前版本存在资源管理错误漏洞，该漏洞源于错误处理后重用Unpacker导致越界读取，可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
msgpack msgpack-python < 1.2.1 affected
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I. Basic Information for CVE-2026-57585

Vulnerability Information
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Vulnerability Title
MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error
Source: CVE Program / CVE List V5
Vulnerability Description
MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
MessagePack 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MessagePack是MessagePack组织开源的一个消息序列化格式。 MessagePack 1.2.1之前版本存在资源管理错误漏洞，该漏洞源于错误处理后重用Unpacker导致越界读取，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
msgpack msgpack-python < 1.2.1 -

II. Public POCs for CVE-2026-57585

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7992 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-57585

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Patches & Fixes for CVE-2026-57585 (1)

Vendor Advisories for CVE-2026-57585 (1)

IV. Related Vulnerabilities

Same vendor: msgpack
Same weakness: CWE-416

V. Comments for CVE-2026-57585

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