src/sdp.c in bluez-libs 3.30 in BlueZ, and other bluez-libs before 3.34 and bluez-utils before 3.34 versions, does not validate string length fields in SDP packets, which allows remote SDP servers to cause a denial of service or possibly have unspecified other impact via a crafted length field that triggers excessive memory allocation or a buffer over-read.

In BlueZ 5.42, an out-of-bounds read was identified in "packethexdump" function in "monitor/packet.c" source file. This issue can be triggered by processing a corrupted dump file and will result in btmon crash.

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of BlueZ. An attacker must first obtain the ability to pair a malicious Bluetooth device with the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.1. The following CVEs are assigned: CVE-2026-19774.