ruby-msgpack: MessagePack for Ruby is an implementation of the MessagePack binary serialization format
CVE-2026-54522 is fixed in ruby-msgpack on 1 platform by DEBIAN-CVE-2026-54522 (version 1.8.3-1), released July 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ruby-msgpack · Debian 14 | 1.8.3-1 | DEBIAN-CVE-2026-54522 | Jul 31, 2026 |
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