What is CVE-2026-53505?

CVE-2026-53505 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-2026-53505?

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

Resource exhaustion in Thumbor

CVE-2026-53505

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…

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-2026-53505?: CVE-2026-53505 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-2026-53505?: High severity. CVSS v3 base score is 7.5 out of 10.