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GHSA-8hq7-ggx2-cc6m
msgpack5Impact
Passing an empty or partial options object disables the default protoAction: 'error' protection. A map containing a __proto__ key can then replace the prototype of the decoded object, potentially changing inherited properties or causing unexpected behavior in downstream code.
Only the decoded object's prototype is affected; this does not modify Object.prototype globally.
Patches
Options are now merged with secure defaults without modifying the caller's object. Unsupported protoAction values are rejected.
Workarounds
Explicitly set protoAction: 'error' whenever constructing a msgpack5 instance, and validate decoded values before use.
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The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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