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Vulnerabilities CVE-2026-54522

CVE-2026-54522

Low
Open
TLP:CLEAR

MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure

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Description

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.

Details

CVSS Score
2.1
EPSS Score
0.14%

3.5th percentile

CVSS Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Jul 30, 2026
Last Modified
Jul 30, 2026
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