(Pwn2Own) Sony XAV-9500ES l2_reassemble_sdu Heap-based Buffer Overflow Remote Code Execution Vulnerability

July 29th, 2026
ZDI-26-474 ZDI-CAN-29072

CVE ID

CVE-2026-18281

CVSS Score

8.0 AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors

Sony

Affected Products

XAV-9500ES

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Sony XAV-9500ES devices. 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 Bluetooth L2CAP packets. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the device.

Additional Details

Sony has issued an update to correct this vulnerability. More details can be found at:
https://www.sony.com/electronics/support/mobile-cd-players-digital-media-players-xav-series/xav-9500es/software/00274922

Disclosure Timeline

  • 2026-03-19 - Vulnerability reported to vendor
  • 2026-07-29 - Coordinated public release of advisory
  • 2026-07-29 - Advisory Updated

Credit

@ExLuck99 and @gr4ss341 of ANHTUD

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