---
id: CVE-2026-53502
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, file_loader decodes percent-encoded path segments after its
  root-boundary validation, allowing traversal outside FILE_LOADER_ROOT_PATH
  through watermark or f…
severity: high
cwe:
  - CWE-22
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-2026-53502'
references:
  - url: >-
      https://github.com/thumbor/thumbor/commit/3b986d13677b30fe6651c8c72ebb25957ac0a40d
    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-cj54-hpcc-gj6h'
    label: security-advisories@github.com
  - url: 'https://github.com/thumbor/thumbor/security/advisories/GHSA-cj54-hpcc-gj6h'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-cj54-hpcc-gj6h'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00522
epssPercentile: 0.41816
aliases:
  - GHSA-cj54-hpcc-gj6h
ecosystem: pip
ingestedAt: '2026-07-31T20:02:43.183Z'
---

## Overview

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, file_loader decodes percent-encoded path segments after its root-boundary validation, allowing traversal outside FILE_LOADER_ROOT_PATH through watermark or frame filter input. 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-2026-53502)

Affected packages:

- `thumbor <= 7.7.7`

Patched in:

- `thumbor 7.8.0`

Source: https://github.com/advisories/GHSA-cj54-hpcc-gj6h