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

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWEDSOURCES 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...