CVE-2026-53505CWE-400denial-of-service

CVE-2026-53505

High · published July 31, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
48.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00609 · 48.5th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-07-31T23:17Z
References (3)
https://github.com/thumbor/thumbor/commit/2c716119de986cfc68c7071af52a98187e006023 · [email protected]https://github.com/thumbor/thumbor/releases/tag/7.8.0 · [email protected]https://github.com/thumbor/thumbor/security/advisories/GHSA-phj3-59pf-cp83 · [email protected]
EPSS history
Timeline
  • 31 JUL 19:00Z
    Thumbor proportion filter allows unbounded post-transform resize leading to remote DoS
    cvelistv5