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

CVE-2026-53500

Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
thumbor / thumbor	affected < 7.8.0

CWE

CWE-918

References

https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7
https://github.com/thumbor/thumbor/releases/tag/7.8.0

ADP enrichment

CISA-ADP

No English description supplied.

https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537