High 7.5Published Jul 31, 2026

CVE-2026-53505Thumbor proportion filter allows unbounded post-transform resize leading to remote DoS

Updated under an hour ago (Oct 28, 2026, 4:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

thumbor thumbor thumbor:thumbor (from the name)	before 7.8.0	CNA record

References

References

https://github.com/thumbor/thumbor/security/advisories/GHSA-phj3-59pf-cp83	x-refsource-confirm
https://github.com/thumbor/thumbor/commit/2c716119de986cfc68c7071af52a98187e006023	x-refsource-misc
https://github.com/thumbor/thumbor/releases/tag/7.8.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.