{"cve":"CVE-2026-53503","nvd":{"published":"2026-07-31T19:17:09.737","modified":"2026-09-08T20:51:43.490","status":"Deferred","description":"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/_convolution.c) where it is used as a divisor (for % and /) without validating columns > 0. When columns=0, the C code triggers undefined behavior; on x86_64 this reliably results in a fatal divide-by-zero trap (SIGFPE) and crashes the Thumbor process, causing a remote denial of service. This issue is fixed in 7.8.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-20","CWE-369"],"references":["https://github.com/thumbor/thumbor/commit/447e192e3fb92e64c12e5354a56a4a7133f69d73","https://github.com/thumbor/thumbor/releases/tag/7.8.0","https://github.com/thumbor/thumbor/security/advisories/GHSA-cqjp-jf4r-h5q9","https://github.com/thumbor/thumbor/security/advisories/GHSA-cqjp-jf4r-h5q9"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:47:10.050265369+00:00"},"epss":{"cve":"CVE-2026-53503","score":0.0075,"percentile":0.54987,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-cqjp-jf4r-h5q9","url":"https://osv.dev/vulnerability/GHSA-cqjp-jf4r-h5q9","summary":"Thumbor convolution filter allows divide-by-zero in C extension leading to remote DoS","modified":"2026-08-04T14:41:06.639351419Z","packages":[{"ecosystem":"PyPI","name":"thumbor","purl":"pkg:pypi/thumbor","ranges":["<7.8.0"],"fixed":["7.8.0"]}]},{"id":"PYSEC-2026-3619","url":"https://osv.dev/vulnerability/PYSEC-2026-3619","summary":"Thumbor convolution filter allows divide-by-zero in C extension leading to remote DoS","modified":"2026-08-04T14:30:17.900502764Z","packages":[{"ecosystem":"PyPI","name":"thumbor","purl":"pkg:pypi/thumbor","ranges":["<7.8.0"],"fixed":["7.8.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}