No VulnCrest analysis published for this CVE yet. Below is the original CNA/NVD description, unmodified.
Description
Network UPS Tools is a collection of programs which provide a common interface for monitoring and administering UPS, PDU and SCD hardware. From 2.8.3 to 2.8.5, upsmon in clients/upsmon.c inserts the server-supplied ups.alarm value into shell commands executed by notify(), async_notify(), and wall(). When a monitored device reports an ALARM state and an operator has configured NOTIFYCMD with EXEC in NOTIFYFLAG ALARM, shell metacharacters in the alarm text are evaluated on POSIX or Windows and can execute arbitrary operating-system commands as the upsmon account, which is commonly root. An attacker can control the value through a malicious or compromised upsd, a man-in-the-middle on a plaintext upsd to upsmon connection, or a compromised UPS device whose driver supplies the alarm upstream of upsd; TLS between upsd and upsmon does not mitigate the compromised-device path. This vulnerability is fixed in 2.8.6.
Exploits & detection
No public PoC or detection template found yet.
Timeline
- Published: 03 Nov 2026
- Last modified upstream: 12 Nov 2026
Sources & licenses
- CVE / CVSS / CWE
- NVD record ↗ (unmodified). This product uses the NVD API but is not endorsed or certified by the NVD. CVE® © The MITRE Corporation.
- Exploitation
- CISA KEV (CC0) · EPSS by FIRST.org
- References used for the analysis
- https://github.com/networkupstools/nut/commit/98e073d4cc31f9c73e2fa0c2677540487d902fe7
- https://github.com/networkupstools/nut/commit/dffba911504866695be698bb5ec49eac40d0f66a
- https://github.com/networkupstools/nut/commit/ecf98e7542e4ae2b62b211622ee26989274b2220
- https://github.com/networkupstools/nut/pull/3499
- https://github.com/networkupstools/nut/security/advisories/GHSA-mjgp-j4gm-6qg5
- http://www.openwall.com/lists/oss-security/2026/07/01/10
- Analysis, summary and remediation
- © VulnCrest