GHSA-qw35-55vc-rhgj
msgpack5: Decoding negative int64 values mutates the input buffer
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
Decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer. Applications that retain or reuse encoded input for integrity checks, logging, or subsequent processing may observe silently corrupted data.
Positive integers and other MessagePack value types are not affected.
### Patches
The decoder now computes signed 64-bit values without writing to the input buffer.
### Workarounds
Copy untrusted MessagePack input before decoding it, or do not retain or reuse input buffers after decoding.
References
External links from the advisory. They lead to third-party sites.