This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-54522 →

DEBIAN-CVE-2026-54522

MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.2, MessagePack::Buffer#clear in ext/msgpack/buf...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 ruby-msgpack

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 ruby-msgpack

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 ruby-msgpack

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.3-1"}]}]

References

advisory security-tracker.debian.org