CVE-2026-53500CWE-918ssrf

CVE-2026-53500

High · published July 31, 2026

CVSS v3.1

8.2

EPSS

Percentile

41.8

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 8.2 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
CVSS v4.0: Not supplied
EPSS: 0.00498 · 41.8th percentile
Weakness: CWE-918 · Server-Side Request Forgery (SSRF)
Published: 2026-07-31T23:17Z

References (4)

https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7 · [email protected]https://github.com/thumbor/thumbor/releases/tag/7.8.0 · [email protected]https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537 · [email protected]https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537 · 134c704f-9b21-4f2e-91b3-4a467353bcc0

EPSS history

Timeline

31 JUL 18:35Z
Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot
cvelistv5