CVE-2026-53500 – Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot

​CVE ID :CVE-2026-53500

Published : July 31, 2026, 7:17 p.m. | 36 minutes ago

Description :Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.

Severity: 8.2 | HIGH

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