Wireshark LBMC Fragment Reassembly Integer Overflow Remote Code Execution Vulnerability

November 10th, 2026
ZDI-26-899 ZDI-CAN-32846

CVE ID

CVSS Score

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

Affected Vendors

Wireshark

Affected Products

Wireshark

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Wireshark. Authentication is not required to exploit this vulnerability. However, only instances with LBMC fragment reassembly enabled are vulnerable.

The specific flaw exists within the implementation of LBMC fragment reassembly. The issue results from the lack of proper validation of user-supplied data, which can result in an an integer overflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process.

Additional Details

version 4.6 fix: https://gitlab.com/wireshark/wireshark/-/commit/4d1c6d964c7c0c7a59b0afc14a8e44d5d831ab73;
version 4.4 fix: https://gitlab.com/wireshark/wireshark/-/commit/e2f9595e3d6beaf31344f5de745b0ff4d041bd82


Disclosure Timeline

  • 2026-08-20 - Vulnerability reported to vendor
  • 2026-11-10 - Coordinated public release of advisory
  • 2026-11-10 - Advisory Updated

Credit

HeeChan Kim (@heegong123) of TeamH4C

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