Net::DNS vulnerabilities

Net::DNS versions before 1.57 for Perl allow memory exhaustion via unbounded recursion in sig_data when re-encoding a message with a misplaced TSIG record. The recursion is reached only when the decoded TSIG carries an empty MAC and only from code that re-encodes a decoded message, such as a forwarder or a proxy. Each cycle re-encodes the whole message, so fewer than 100 bytes on the wire exhaust available memory and terminate the process.

A vulnerability in the Net::DNS library for Perl (versions up to 1.55) allows remote code execution via a crafted EDNS EXTENDED ERROR record. The _decompose function improperly handles backtick characters (`), enabling system command injection.

Vulnerability in Net::DNS for Perl up to version 1.55. Allows DoS via deep DNS compression pointer chains. The decode function recursively processes pointers without depth limit, potentially overflowing the stack and causing SIGSEGV.