CVE-2021-23386: DNS-Packet Project DNS-Packet

Medium severity, CVSS 6.5. EPSS: 1.4% chance of exploitation in the next 30 days.

This affects the package dns-packet before 5.2.2. It creates buffers with allocUnsafe and does not always fill them before forming network packets. This can expose internal application memory over unencrypted network when querying crafted invalid domain names.

Affected products

• DNS-Packet Project DNS-Packet: before 1.3.4 (fixed in 1.3.4); from 2.0.0, before 5.2.2 (fixed in 5.2.2)

Published 2021-05-20. Last modified 2026-06-17.