DEBIAN-CVE-2026-53503

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Source
https://security-tracker.debian.org/tracker/CVE-2026-53503
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53503.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-53503
Upstream
Published
2026-07-31T19:17:09Z
Modified
2026-09-09T08:47:32Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:convolution(, , <should_normalize>) 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.

References

Affected packages

Debian:14 / thumbor

Package

Name
thumbor
Purl
pkg:deb/debian/thumbor?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.8.0-1

Affected versions

6.*
6.3.2-3
6.3.2-4
6.5.1-1
6.5.1-2
6.5.1-3
6.5.1-4
6.5.1-5
6.5.1-6
6.5.1-7
6.7.0-1
7.*
7.7.7-1
7.7.7-2
7.7.7-3
7.7.7-4
7.7.7-5
7.7.7-6

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53503.json"