Description
Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:convolution(, , ) filter passes the user-controlled 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.
Severity (CVSS)
| Base score | 7.5 |
|---|---|
| Severity | High |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Provided by | CNA |
Weaknesses
- CWE-20 — CWE-20: Improper Input Validation
- CWE-369 — CWE-369: Divide By Zero
Affected products
| Vendor | Product | Versions |
|---|---|---|
| thumbor | thumbor | < 7.8.0 |
References
- https://github.com/thumbor/thumbor/security/advisories/GHSA-cqjp-jf4r-h5q9 (x_refsource_CONFIRM)
- https://github.com/thumbor/thumbor/commit/447e192e3fb92e64c12e5354a56a4a7133f69d73 (x_refsource_MISC)
- https://github.com/thumbor/thumbor/releases/tag/7.8.0 (x_refsource_MISC)
Generated from the official CVE List on 01 Aug 2026 07:04 UTC.