A vulnerability was found in seladb PcapPlusPlus 25.05 . It has been rated as critical . This affects the function pcpp::TelnetLayer::getSubCommand of the file Packet++/src/TelnetLayer.cpp of the component Telnet Subnegotiation Packet Handler . The manipulation leads to heap-based buffer overflow. This vulnerability is documented as CVE-2026-13589 . The attack can be initiated remotely. Additionally, an exploit exists. It is recommended to apply a patch to fix this issue.