What is CVE-2026-53504?

CVE-2026-53504 is a high-severity vulnerability in Thumbor, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-31.

How severe is CVE-2026-53504?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Thumbor

CVE-2026-53504

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 tim…

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Thumbor — versions < 7.8.0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-53504?: CVE-2026-53504 is a high-severity vulnerability in Thumbor, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-31.
How severe is CVE-2026-53504?: High severity. CVSS v3 base score is 7.5 out of 10.