EmbedThis Updater Heap-based Buffer Overflow Remote Code Execution Vulnerability

November 13th, 2026
ZDI-26-973 ZDI-CAN-27329

CVE ID

CVSS Score

7.5 AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

EmbedThis

Affected Products

Updater

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of EmbedThis Updater. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of server responses. 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 current process.

Additional Details

EmbedThis has issued an update to correct this vulnerability. More details can be found at:
https://github.com/embedthis/updater/commit/094983901d9cb3cbfac349a2a31138a339b016b0

Disclosure Timeline

  • 2025-10-03 - Vulnerability reported to vendor
  • 2026-11-13 - Coordinated public release of advisory
  • 2026-11-13 - Advisory Updated

Credit

Tyler Zars

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