CVE-2026-107704: Jtescher Image Optimizer

Critical severity, CVSS 9.8. EPSS: 1.7% chance of exploitation in the next 30 days.

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.

Affected products

• Jtescher Image Optimizer: from 1.3.0, up to and including 1.9.0

Published 2026-10-08. Last modified 2026-10-09.