What is CVE-2026-53503?

CVE-2026-53503 is a high-severity vulnerability in Thumbor, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-07-31.

How severe is CVE-2026-53503?

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

Improper input validation in Thumbor

CVE-2026-53503

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:convolution(<matrix>, <columns>, <should_normalize>) filter passes the user-controlled <columns> value to a C extension (thumbor/ext/filters/…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

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-20 — Improper Input Validation
CWE-369 — Divide By Zero

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-2026-53503?: CVE-2026-53503 is a high-severity vulnerability in Thumbor, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-07-31.
How severe is CVE-2026-53503?: High severity. CVSS v3 base score is 7.5 out of 10.