CVE-2026-53505
HIGHThumbor < 7.8.0 Proportion Filter - Denial of Service
Title source: manualDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/thumbor/thumbor/security/advisories/GHSA-phj3-59pf-cp83
X_Refsource_Misc x_refsource_misc
https://github.com/thumbor/thumbor/commit/2c716119de986cfc68c7071af52a98187e006023
X_Refsource_Misc x_refsource_misc
https://github.com/thumbor/thumbor/releases/tag/7.8.0
Scores
CVSS v3
7.5
EPSS
0.0034
EPSS Percentile
26.7%
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