CVE-2026-53505
Thumbor proportion filter allows unbounded post-transform resize leading to remote DoS
- State
- Published
- Severity
- 7.5 High
- Published
- Jul 31, 2026
- Updated
- Aug 3, 2026
- Reserved
- Jun 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
Weaknesses
- CWE-400 Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
thumborthumbor |
|
References
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