AIKIDO-2026-323842
MessagePack is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
MessagePackTL;DR
The MessagePackReader.TrySkip path recursively descends nested arrays and maps without applying MessagePackSecurity.MaximumObjectGraphDepth. Formatters that skip unknown members on untrusted payloads can therefore recurse until the process hits an uncatchable StackOverflowException. The fix makes skip traversal iterative and enforces depth accounting so exceeded limits throw catchable serialization errors instead of terminating the host.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and deserialize untrusted MessagePack payloads.
Background info
MessagePack is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 2.5.300 and 3.0.0 - 3.1.6.
How to fix this
Upgrade the MessagePack library to the patch version.
Are You Affected?
Connect your repositories to instantly see whether vulnerable or malicious packages exist in your codebase.
Free. No credit card required.
SOC 2Compliant
ISO 27001Compliant