CVEvulnerability

CVE-2026-53503

7.5 HIGH Published 2026-07-31 Modified 2026-09-08 Official page ↗
Status
Deferred
Published
2026-07-31
Last modified
2026-09-08
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-20, CWE-369

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.

Related

Weakness · CWE (2)

  • CWE-20 Improper Input Validation weakness
  • CWE-369 Divide By Zero weakness

References