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Vulnerability · Published Nov 5, 2026 · Assigned by GitHub_M

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

Low 2.4

In plain English

A low-severity security flaw in nut from networkupstools. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)2.4Low
Exploit odds (30 days)0.2%top 95.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12nutno fix listedDEBIAN-CVE-2026-85068
Debian:13nutno fix listedDEBIAN-CVE-2026-85068
Debian:14nutno fix listedDEBIAN-CVE-2026-85068
Ubuntu:22.04:LTSnutno fix listedUBUNTU-CVE-2026-85068
Ubuntu:24.04:LTSnutno fix listedUBUNTU-CVE-2026-85068
Ubuntu:26.04:LTSnutno fix listedUBUNTU-CVE-2026-85068
Ubuntu:26.10nutno fix listedUBUNTU-CVE-2026-85068

Affected products (as reported)

VendorProductVersions
networkupstools nut >= 2.4.2, <= 2.8.5

Weakness: CWE-457 · Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References