The issue is as follows: when msgpack5 decodes a map containing a
key "__proto__", it assigns the decoded value to __proto__. As you
are no doubt aware, Object.prototype.__proto__ is an accessor
property for the receiver's prototype. If the value corresponding to
the key __proto__ decodes to an object or null, msgpack5 sets
the decoded object's prototype to that value.
An attacker who can submit crafted MessagePack data to a service can
use this to produce values that appear to be of other types; may have
unexpected prototype properties and methods (for example length,
numeric properties, and push et al if __proto__'s value decodes to
an Array); and/or may throw unexpected exceptions when used (for
example if the __proto__ value decodes to a Map or Date). Other
unexpected behavior might be produced for other types.
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Bumps msgpack5 from 4.2.0 to 4.5.1. This update includes a security fix.
Vulnerabilities fixed
Sourced from The GitHub Security Advisory Database.
... (truncated)
Release notes
Sourced from msgpack5's releases.
Commits
1f7becdBumped v4.5.12f3ade7fix: prevent object prototype poisoning (#99)438762fBumped v4.5.0827ed09Bumped v4.2.1.2b96cd2Handle NaN (#75)Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
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