CVE-2021-3521

There is a flaw in RPM’s signature functionality. OpenPGP subkeys are
associated with a primary key via a “binding signature.” RPM does not check
the binding signature of subkeys prior to importing them. If an attacker is
able to add or socially engineer another party to add a malicious subkey to
a legitimate public key, RPM could wrongly trust a malicious signature. The
greatest impact of this flaw is to data integrity. To exploit this flaw, an
attacker must either compromise an RPM repository or convince an
administrator to install an untrusted RPM or public key. It is strongly
recommended to only use RPMs and public keys from trusted sources.

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