CVE-2026-53504

HIGH

Thumbor has Regex Denial of Service (ReDoS) in `convolution` filter

Title source: cna
STIX 2.1

Description

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the convolution filter regular expression performs exponential backtracking on crafted repeated numeric input, allowing a URL request to exhaust processing time. This issue is fixed in 7.8.0.

References (3)

Core 3

Scores

CVSS v3 7.5
EPSS 0.0034
EPSS Percentile 26.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (2)
pypi/thumbor 0 - 7.8.0PyPI
thumbor/thumbor < 7.8.0
Published Jul 31, 2026
Tracked Since Aug 01, 2026