Is CVE-2026-53505 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-53505?

CVE-2026-53505 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-53505

Description

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 large resizes (CPU/memory exhaustion) and cause denial of service. This issue is fixed in 7.8.0.