---
id: CVE-2026-53505
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, Thumbor's filters:proportion(<value>) filter does not enforce an upper
  bound on <value> and runs in the post-transform phase. An attacker can trigger
  extreme…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
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-2026-53505'
references:
  - url: >-
      https://github.com/thumbor/thumbor/commit/2c716119de986cfc68c7071af52a98187e006023
    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-phj3-59pf-cp83'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-phj3-59pf-cp83'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00609
epssPercentile: 0.46853
aliases:
  - GHSA-phj3-59pf-cp83
ecosystem: pip
ingestedAt: '2026-07-31T20:02:43.210Z'
---

## Overview

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:proportion(<value>) filter does not enforce an upper bound on <value> and runs in the post-transform phase. An attacker can trigger extremely large resizes (CPU/memory exhaustion) and cause denial of service. 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-2026-53505)

Affected packages:

- `thumbor <= 7.7.7`

Patched in:

- `thumbor 7.8.0`

Source: https://github.com/advisories/GHSA-phj3-59pf-cp83