Command Injection Vulnerability in OPNsense Firmware by Deciso
CVE-2026-119409

8.6HIGH

Key Information:

Vendor

Opnsense

Status
Core
Vendor
CVE Published:
30 October 2026

What is CVE-2026-119409?

The vulnerability allows authenticated users with the System: Firmware privilege in OPNsense to execute arbitrary commands as root. This is achieved by manipulating the firmware mirror URL to inject malicious commands, which are evaluated by opnsense-update through an insecure eval function. Furthermore, attackers can exploit sed injection to disable package signature verification, significantly increasing the risk of unauthorized code execution and potential system compromise.

Affected Version(s)

core 0 < 26.7.8

core 26.7.8

References

https://github.com/opnsense/core/security/advisories/GHSA...
vendor-advisory
https://github.com/opnsense/core/commit/1cc41fc39da99d598...
patch
https://github.com/opnsense/core/commit/8e214533d33c3af74...
patch

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Voidlet
Abraxas Labs
Franco Fichtner
.