RCE in Jtescher Image Optimizer
CVE-2026-107704
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- gist.github.com/R3tro16/a99a058d24a06692721a6a3fade9649d (third-party-advisory)
- github.com/jtescher/image_optimizer/blob/v1.9.0/lib/image_optimizer.rb (technical-description)
- github.com/jtescher/image_optimizer/blob/v1.9.0/lib/image_optimizer/shell.rb (technical-description)
- github.com/jtescher/image_optimizer (product)
- www.vulncheck.com/advisories/image-optimizer-1.3.0-through-1.9.0-os-command-inj… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-107704?
- CVE-2026-107704 is a critical-severity vulnerability in Jtescher Image Optimizer, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-10-08.
- How severe is CVE-2026-107704?
- Critical severity. CVSS v3 base score is 9.8 out of 10.