{"api_version":"1","generated_at":"2026-07-31T20:50:44+00:00","cve":"CVE-2026-53503","urls":{"html":"https://cve.report/CVE-2026-53503","api":"https://cve.report/api/cve/CVE-2026-53503.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53503","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53503"},"summary":{"title":"Thumbor convolution filter allows divide-by-zero in C extension leading to remote DoS","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. 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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.","Type":"Description","Title":"Thumbor convolution filter allows divide-by-zero in C extension "}]}}}