USN-6758-1: JSON5 vulnerability

Ubuntu Security Advisory

It was discovered that the JSON5 parse method incorrectly handled the parsing
of keys named __proto__. An attacker could possibly use this issue to pollute
the prototype of the returned object, setting arbitrary or unexpected keys, and
cause a denial of service, allow unintended access to network services or have
other unspecified impact, depending on the application’s use of the module.

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