CVE-2026-53504: Thumbor

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the convolution filter regular expression performs exponential backtracking on crafted repeated numeric input, allowing a URL request to exhaust processing time. This issue is fixed in 7.8.0.

Affected products

• Thumbor Thumbor: before 7.8.0 (fixed in 7.8.0)

Published 2026-07-31. Last modified 2026-09-08.