high7.5
CVE-2026-57585
MessagePack is the serializer implementation for Python msgpack.org.
Impact
MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Msgpack | Messagepack | before 1.2.1 |