Vulnerability Details CVE-2026-57585
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 20.5%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-57585
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cpe:2.3:a:msgpack:messagepack:0.1.10
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cpe:2.3:a:msgpack:messagepack:0.1.11
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cpe:2.3:a:msgpack:messagepack:0.1.12
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cpe:2.3:a:msgpack:messagepack:0.1.13
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cpe:2.3:a:msgpack:messagepack:0.1.2
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cpe:2.3:a:msgpack:messagepack:0.1.3
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cpe:2.3:a:msgpack:messagepack:0.1.5
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cpe:2.3:a:msgpack:messagepack:0.1.6
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cpe:2.3:a:msgpack:messagepack:0.1.7
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cpe:2.3:a:msgpack:messagepack:0.2.0
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cpe:2.3:a:msgpack:messagepack:0.2.1
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cpe:2.3:a:msgpack:messagepack:0.2.2
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cpe:2.3:a:msgpack:messagepack:0.2.3
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cpe:2.3:a:msgpack:messagepack:0.2.4
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cpe:2.3:a:msgpack:messagepack:0.3.0
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cpe:2.3:a:msgpack:messagepack:0.4.0
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cpe:2.3:a:msgpack:messagepack:0.4.1
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cpe:2.3:a:msgpack:messagepack:0.4.2
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cpe:2.3:a:msgpack:messagepack:0.4.3
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cpe:2.3:a:msgpack:messagepack:0.4.4
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cpe:2.3:a:msgpack:messagepack:0.4.6
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cpe:2.3:a:msgpack:messagepack:0.4.7
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cpe:2.3:a:msgpack:messagepack:0.4.8
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cpe:2.3:a:msgpack:messagepack:0.5.0
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cpe:2.3:a:msgpack:messagepack:0.5.1
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cpe:2.3:a:msgpack:messagepack:0.5.2
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cpe:2.3:a:msgpack:messagepack:0.5.3
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cpe:2.3:a:msgpack:messagepack:0.5.4
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cpe:2.3:a:msgpack:messagepack:0.5.5
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cpe:2.3:a:msgpack:messagepack:0.5.6
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cpe:2.3:a:msgpack:messagepack:0.6.0
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cpe:2.3:a:msgpack:messagepack:0.6.1
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cpe:2.3:a:msgpack:messagepack:0.6.2
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cpe:2.3:a:msgpack:messagepack:1.0.0
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cpe:2.3:a:msgpack:messagepack:1.0.1
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cpe:2.3:a:msgpack:messagepack:1.0.2
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cpe:2.3:a:msgpack:messagepack:1.0.3
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cpe:2.3:a:msgpack:messagepack:1.0.4
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cpe:2.3:a:msgpack:messagepack:1.0.5
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cpe:2.3:a:msgpack:messagepack:1.0.6
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cpe:2.3:a:msgpack:messagepack:1.0.7
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cpe:2.3:a:msgpack:messagepack:1.0.8
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cpe:2.3:a:msgpack:messagepack:1.1.0
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cpe:2.3:a:msgpack:messagepack:1.1.1
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cpe:2.3:a:msgpack:messagepack:1.1.2
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cpe:2.3:a:msgpack:messagepack:1.2.0