High 8.2Published Jul 31, 2026

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

Updated under an hour ago (Oct 27, 2026, 5:50 AM ET)

Does this affect you?

It affects thumbor. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for thumbor

Exploited in the last 30 days

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.

CVSS: 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

thumbor thumbor thumbor:thumbor (from the name)	before 7.8.0	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.