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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| msgpack | msgpack-ruby | < 1.8.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | ruby-msgpack | 1.8.3-1 | — |
| Debian 13 | ruby-msgpack | No fix yet | — |
| Debian 12 | ruby-msgpack | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | ruby-msgpack | No fix yet | — |
| Ubuntu 24.04 LTS | ruby-msgpack | No fix yet | — |
| Ubuntu 22.04 LTS | ruby-msgpack | No fix yet | — |
| Ubuntu 20.04 LTS | ruby-msgpack | No fix yet | — |
| Ubuntu 18.04 LTS | ruby-msgpack | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | ruby-msgpack | No fix yet | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | python-msgpack | No fix yet | — |
| Azure Linux 3 | rubygem-msgpack | 1.8.4-1 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | ruby3.2-fluentd-kubernetes-daemonset-1.19-kinesis | 1.19.2.1.1-r7 | — |
| Wolfi rolling | ruby3.2-kube-logging-operator-fluentd-outputs +1 | 6.8.0-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | msgpack | < 1.8.2 | 1.8.2 | GHSA-4mrv-5p47-p938 |