# CVE-2026-85068: NUT blazer_usb ippon_command stack info-leak via unzeroed char tmp[64] in OUT-direction usb_control_msg

Status: published. Published: 2026-11-05. Updated: 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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- networkupstools / nut: >= 2.4.2, <= 2.8.5 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 2.4 (low); CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-457

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/networkupstools/nut/security/advisories/GHSA-fjxc-2vpv-mqc8 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/networkupstools/nut/pull/3529 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/networkupstools/nut/commit/30d56d4282f823949b40763d5c76461c7dd107b3 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-85068; retrieved 2026-11-05; source updated 2026-11-05

Revision: 327d4d055ab9e25322195c7c68697a31377a51e85ae2cb66af34e6e5a94b2572

Canonical: https://y2.dev/cve/CVE-2026-85068

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