CVE-2026-85068

CVSS 2.4 (low) · published 2026-11-05

Network UPS Tools is a collection of programs which provide a common interface for monitoring and administering UPS, PDU and SCD hardware. From 2.4.2 through 2.8.5, ippon_command in drivers/blazer_usb.c partially initializes char tmp[64] with a short Megatec status query and then passes a fixed eight-byte chunk to usb_control_msg. A malicious firmware-controlled USB device presenting the Mustek Powermust VID 0x06da and Mustek Powermust PID 0x0003 matches blazer_usb_id, selects ippon_subdriver, and can receive the uninitialized trailing stack bytes during normal polling. The disclosure is bounded and read-only, requires physical or supply-chain access to the USB bus, and has no established integrity or availability impact. This issue is scheduled to be fixed in version 2.8.6.

Weakness: CWE-457

Source: NVD CVE-2026-85068

References

• https://github.com/networkupstools/nut/commit/30d56d4282f823949b40763d5c76461c7dd107b3
• https://github.com/networkupstools/nut/pull/3529
• https://github.com/networkupstools/nut/security/advisories/GHSA-fjxc-2vpv-mqc8
• https://github.com/networkupstools/nut/security/advisories/GHSA-fjxc-2vpv-mqc8

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