CVE-2026-54522 - MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure

CVE-2026-54522 - MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure

https://cvefeed.io/rssfeed/latest.atom / Thu, 07/30/2026 - 22:08
CVE ID :CVE-2026-54522
Published : July 30, 2026, 5:16 p.m. | 1 hour, 36 minutes ago
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.
Severity: 2.1 | LOW
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