Thumbor proportion filter allows unbounded post-transform resize leading to remote DoS

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53505
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-31 19:17:10 UTC
Updated2026-07-31 19:17:10 UTC
DescriptionThumbor 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-400 | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Thumbor Thumbor affected < 7.8.0 Not specified

References

ReferenceSourceLinkTags
github.com/thumbor/thumbor/releases/tag/7.8.0 [email protected] github.com
github.com/thumbor/thumbor/security/advisories/GHSA-phj3-59pf-cp83 [email protected] github.com
github.com/thumbor/thumbor/commit/2c716119de986cfc68c7071af52a98187e006023 [email protected] github.com
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