CVE-2026-53504
Received Received - Intake

Thumbor Convolution Filter ReDoS Vulnerability

Publication date: 2026-07-31

Last updated on: 2026-07-31

Assigner: GitHub, Inc.

Description
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.

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Meta Information

Published
2026-07-31
Last Modified
2026-07-31
Generated
2026-08-01
AI Q&A
2026-07-31
EPSS Evaluated
N/A
NVD
CVE-2026-53504
EUVD
EUVD-2026-51610

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
globo.com thumbor to 7.8.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

Thumbor before version 7.8.0 has a vulnerability in the convolution filter where a regular expression causes exponential backtracking when processing crafted repeated numeric input in a URL. This leads to excessive processing time and potential denial of service.

Detection Guidance

To detect this vulnerability, check the Thumbor version running on your system. If it is below 7.8.0, it is vulnerable. Run: thumbor --version to verify. Monitor for unusually high CPU usage during image processing requests, which may indicate exploitation attempts.

Impact Analysis

This vulnerability can allow an attacker to send specially crafted requests that consume excessive server resources, leading to degraded performance or complete unavailability of the Thumbor service.

Compliance Impact

This vulnerability causes denial-of-service via CPU exhaustion, which could disrupt services handling personal data. GDPR requires appropriate technical measures to ensure data availability and integrity, while HIPAA mandates safeguards against service disruptions affecting protected health information. Exploits could lead to prolonged unavailability, potentially violating these requirements.

Mitigation Strategies

Upgrade Thumbor to version 7.8.0 or later to address the convolution filter regular expression issue.

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