CVE-2026-53505
High
Description
Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:proportion(<value>) filter does not enforce an upper bound on <value> and runs in the post-transform phase. An attacker can trigger extremely large resizes (CPU/memory exhaustion) and cause denial of service. This issue is fixed in 7.8.0.
SeverityHigh
CVSS7.5
Exploit probability—
ProductThumbor
PublishedJul 31, 2026
First seenJul 31, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- thumbor7.8.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| thumborPyPI | v < 7.8.0 | 7.8.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.