CVE-2026-19774 BlueZ A2DP Stack-based Buffer Overflow Remote Code Execution Vulnerability
Network-adjacent attackers can execute arbitrary code with root privileges via a stack-based buffer overflow in BlueZ A2DP handling after pairing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-19774?
CVE-2026-19774 is a high-severity memory corruption vulnerability in BlueZ, published on 15 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
BlueZ A2DP Stack-based Buffer Overflow Remote Code Execution Vulnerability. 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 specific flaw exists within the handling of the stream endpoints. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-29429.
Weakness: CWE-121
Which versions are affected by CVE-2026-19774?
How do I fix CVE-2026-19774?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-19774 being exploited?
There is no known exploitation of CVE-2026-19774 in the wild and no public exploit code.
Sources
Also known as AZL-103122, DEBIAN-CVE-2026-19774, GHSA-53cx-rp5p-x795, ROOT-OS-DEBIAN-12-CVE-2026-19774, ROOT-OS-DEBIAN-13-CVE-2026-19774, UBUNTU-CVE-2026-19774 and 1 more.