---
id: CVE-2026-53500
title: Thumbor is an open-source photo thumbnail service by globo.com
summary: >-
  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.…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L'
cwe:
  - CWE-918
  - CWE-1333
vendor: thumbor
product: thumbor
affected:
  - thumbor <= 7.7.7
patched:
  - thumbor 7.8.0
published: '2026-07-31'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:51:43.490'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53500'
references:
  - url: >-
      https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7
    label: security-advisories@github.com
  - url: 'https://github.com/thumbor/thumbor/releases/tag/7.8.0'
    label: security-advisories@github.com
  - url: 'https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537'
    label: security-advisories@github.com
  - url: 'https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-6x26-6r6f-m537'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00498
epssPercentile: 0.40128
aliases:
  - GHSA-6x26-6r6f-m537
ecosystem: pip
ingestedAt: '2026-07-31T19:01:36.600Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-53500)

Affected packages:

- `thumbor <= 7.7.7`

Patched in:

- `thumbor 7.8.0`

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