CVE-2026-53504

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

State: Published
Severity: 7.5 High
Published: Jul 31, 2026
Updated: Jul 31, 2026
Reserved: Jun 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
thumborthumbor	< 7.8.0Affected

References

https://github.com/thumbor/thumbor/security/advisories/GHSA-5vjc-7cxw-4w6j
https://github.com/thumbor/thumbor/commit/3f38fe1610d20168e91f76d432212de30727eb2e
https://github.com/thumbor/thumbor/releases/tag/7.8.0

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