{"id":"CVE-2026-53505","aliases":["GHSA-phj3-59pf-cp83","PYSEC-2026-3621"],"url":"https://o3.security/vulnerability/CVE-2026-53505","summary":"Thumbor proportion filter allows unbounded post-transform resize leading to remote DoS","details":"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.","published":"2026-07-31T19:00:22.755Z","modified":"2026-09-10T03:31:03.693324534Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00335,"percentile":0.26587,"asOf":"2026-09-15"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"thumbor","fixedVersion":"7.8.0"}],"fix":{"url":"https://github.com/thumbor/thumbor/commit/2c716119de986cfc68c7071af52a98187e006023","label":"thumbor/thumbor@2c71611"},"references":[{"type":"WEB","url":"https://github.com/thumbor/thumbor/releases/tag/7.8.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53505.json"},{"type":"ADVISORY","url":"https://github.com/thumbor/thumbor/security/advisories/GHSA-phj3-59pf-cp83"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53505"},{"type":"FIX","url":"https://github.com/thumbor/thumbor/commit/2c716119de986cfc68c7071af52a98187e006023"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:31:03.693324534Z"}}