thumbor: Thumbor is an open-source photo thumbnail service by globo.com
CVE-2026-53503 is fixed in thumbor on 1 platform by DEBIAN-CVE-2026-53503 (version 7.8.0-1), released August 1, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| thumbor · Debian 14 | 7.8.0-1 | DEBIAN-CVE-2026-53503 | Aug 1, 2026 |
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