Intel

AIKIDO-2025-10260

mailauth is vulnerable to Prototype Pollution

Prototype Pollution Pre-CVE
Found by Aikido Intel before public disclosure or CVE publication.
Published Apr 22, 2025

48

Medium Risk

This Affects:

JSmailauth
1.0.0 - 4.8.2
Fixed in 4.8.3
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TL;DR

Affected versions of this package are vulnerable to prototype pollution when parsing a DKIM header, as untrusted input may be used to manipulate object prototypes, potentially leading to denial of service or other unexpected behavior.

Who does this affect?

You are affected if you are using a version that falls within the vulnerable range.

Background info

mailauth is vulnerable to Prototype Pollution in versions 1.0.0 - 4.8.2.

How to fix this

Upgrade the mailauth library to the patch version.