CVE-2026-45158Public exploitNetwork attack vector

Authenticated root command execution via injected DHCP hostname

Published May 13, 2026 · Updated May 13, 2026

Command injection in Deciso B.V. OPNsense core before 26.1.8 allows remote authenticated users to execute commands as root via DHCP settings. The interface_dhcp_configure function writes an unvalidated dhcphostname into dhclient..conf, where dhclient passes an injected media value to an eval statement in dhclient-script. Exploitation requires page-interfaces privileges, IPv4 DHCP on the configured interface, and applying changes or another DHCP request to trigger the script.

CVSS severity9.1
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Deciso B.V. OPNsense core before 26.1.8 allows remote authenticated users to execute commands as root via DHCP settings. The interface_dhcp_configure function writes an unvalidated dhcphostname into dhclient..conf, where dhclient passes an injected media value to an eval statement in dhclient-script. Exploitation requires page-interfaces privileges, IPv4 DHCP on the configured interface, and applying changes or another DHCP request to trigger the script.

The record

CVE
CVE-2026-45158
Published
May 13, 2026
Updated
May 13, 2026
Vendor
Deciso B.V.
Product
core
Classifications
CWE-88, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 26.1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Deciso B.V. · coreversion=< 26.1.8

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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