{"id":"CVE-2026-53500","aliases":["GHSA-6x26-6r6f-m537","PYSEC-2026-3617"],"url":"https://o3.security/vulnerability/CVE-2026-53500","summary":"Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot","details":"Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the ALLOWED_SOURCES configuration passes plain strings to re.match() without escaping dots, so a hostname differing at dot positions can match the allowlist. This issue is fixed in 7.8.0.","published":"2026-07-31T18:35:54.234Z","modified":"2026-09-10T03:30:53.872626015Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L"},"epss":{"score":0.00287,"percentile":0.2113,"asOf":"2026-09-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"thumbor","fixedVersion":"7.8.0"}],"fix":{"url":"https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7","label":"thumbor/thumbor@6887671"},"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-2026-53500.json"},{"type":"ADVISORY","url":"https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53500"},{"type":"FIX","url":"https://github.com/thumbor/thumbor/commit/68876715350c6c8f49c324e5515e64908830aed7"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:30:53.872626015Z"}}