Advisory Details

February 4th, 2026

NVIDIA Megatron-LM load_base_checkpoint Deserialization of Untrusted Data Remote Code Execution Vulnerability

ZDI-26-060
ZDI-CAN-27989

CVE ID CVE-2026-24149
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS NVIDIA
AFFECTED PRODUCTS Megatron
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of NVIDIA Megatron-LM. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of checkpoints. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS NVIDIA has issued an update to correct this vulnerability. More details can be found at:
https://nvidia.custhelp.com/app/answers/detail/a_id/5712
DISCLOSURE TIMELINE
  • 2025-09-24 - Vulnerability reported to vendor
  • 2026-02-04 - Coordinated public release of advisory
  • 2026-02-04 - Advisory Updated
CREDIT Michael DePlante (@izobashi) of Trend Zero Day Initiative
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