Is CVE-2026-107704 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-107704?

CVE-2026-107704 has a CVSS v3 severity of CRITICAL (9.8).

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CVE-2026-107704

Description

The image_optimizer Ruby gem 1.3.0 through 1.9.0 contains an OS command injection vulnerability in ImageOptimizer#identify_format that allows attackers to execute commands by supplying a crafted image path when the identify option is enabled. Attackers controlling the path, such as an uploaded file name, can append shell metacharacters like ';' that are executed via Ruby backticks with the Ruby process privileges.