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CVE Vulnerability Details :

CVE-2026-57585

PUBLISHED

More Info Official Page

Assigner-GitHub_M

Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa

Published At-30 Jun, 2026 | 21:36

Updated At-01 Jul, 2026 | 14:54

▼CVE Numbering Authority (CNA)

MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error

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.

Affected Products

Vendor

msgpack

Product

msgpack-python

Versions

Affected

< 1.2.1

Problem Types

Type	CWE ID	Description
CWE	CWE-416	CWE-416: Use After Free

Type: CWE

CWE ID: CWE-416

Description: CWE-416: Use After Free

Metrics

Version	Base score	Base severity	Vector
3.1	7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Version: 3.1

Base score: 7.5

Base severity: HIGH

Vector:

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

References

Hyperlink	Resource
https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964	x_refsource_CONFIRM
https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d	x_refsource_MISC

Hyperlink: https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964

Resource:

x_refsource_CONFIRM

Hyperlink: https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d

Resource:

x_refsource_MISC

▼Authorized Data Publishers (ADP)

CISA ADP Vulnrichment

Affected Products

Affected

Problem Types

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Metrics Other Info

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Exploits

Credits

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Replaced By

Rejected Reason

References

Affected Products

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References