msgpack CVEs · Not applicable

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Overview 2 matches · 0 in Waratek scope · 0 protected · 0 exploited · 0 CISA KEV · 0 public PoC · 0 EPSS ≥ 0.5

2matches 0in Waratek scope0.0% 0protected0.0% 0exploited0.0% 0CISA KEV0.0% 0public PoC0.0% 0EPSS ≥ 0.50.0%

Protected by Waratek 0 0.0% Rule in development 0 0.0% Mitigation candidate 0 0.0% No exploit published 0 0.0% Outside Waratek scope 0 0.0% Not applicable 2 100.0% Withdrawn CVE 0 0.0%

Critical 0 0.0% High 1 50.0% Medium 0 0.0% Low 1 50.0% None 0 0.0% Unknown 0 0.0%

blocked by ARMR today 0 0.0% partly blocked 0 0.0% not blocked 2 100.0% not established 0 0.0% unrecorded 0 0.0%

Exploited 0 0.0% Working exploit published 0 0.0% Proof of concept only 1 50.0% Forecast only 0 0.0% No public exploit 1 50.0%

split by StatusSeverityProtectionExploit maturity peak 1 / month

Jun 261 Not applicable1 High1 not blocked1 No public exploit1 Jul 261 Not applicable1 Low1 not blocked1 Proof of concept only1

Jun 26Jul 26

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CVE	Severity	Published▾	Status	Exploitation	Description
CVE-2026-54522	Low	2026-07-30	Not applicable	Proof of concept only	MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.2, MessagePack::Buffer#clear in ext/msgpack/buffer.c leaves rmem_last, rmem_end, and rmem_owner stale after _msgpack_buffer_shift_chunk returns an rmem page to the shared pool, allowing a subsequent Buffer#write and a second MessagePack::Buffer to alias the page and disclose or corrupt cross-buffer data. This issue is fixed in version 1.8.2.
CVE-2026-57585	High	2026-06-30	Not applicable	No public exploit	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.

CVE

Severity

Published▾

Status

Exploitation

Description

CVE-2026-54522

Low

2026-07-30

Not applicable

Proof of concept only

MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.2, MessagePack::Buffer#clear in ext/msgpack/buffer.c leaves rmem_last, rmem_end, and rmem_owner stale after _msgpack_buffer_shift_chunk returns an rmem page to the shared pool, allowing a subsequent Buffer#write and a second MessagePack::Buffer to alias the page and disclose or corrupt cross-buffer data. This issue is fixed in version 1.8.2.

CVE-2026-57585

High

2026-06-30

Not applicable

No public exploit

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.