DEBIAN-CVE-2026-53503
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.
DEBIAN-CVE-2026-53503
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-53503
thumbor
Source reference: /affected/0/package/name
- Affected versions
- 6.3.2-3
Source reference:
/affected/0/versions6.3.2-4Source reference:
/affected/0/versions6.5.1-1Source reference:
/affected/0/versions6.5.1-2Source reference:
/affected/0/versions6.5.1-3Source reference:
/affected/0/versions6.5.1-4Source reference:
/affected/0/versions6.5.1-5Source reference:
/affected/0/versions6.5.1-6Source reference:
/affected/0/versions6.5.1-7Source reference:
/affected/0/versions6.7.0-1Source reference:
/affected/0/versions7.7.7-1Source reference:
/affected/0/versions7.7.7-2Source reference:
/affected/0/versions7.7.7-3Source reference:
/affected/0/versions7.7.7-4Source reference:
/affected/0/versions7.7.7-5Source reference:
/affected/0/versions7.7.7-6Source reference:
/affected/0/versions - Fixed versions
- 7.8.0-1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.8.0-1"
}
]
}
],
"package": {
"name": "thumbor",
"purl": "pkg:deb/debian/thumbor?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"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",
"7.7.7-1",
"7.7.7-2",
"7.7.7-3",
"7.7.7-4",
"7.7.7-5",
"7.7.7-6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53503.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57331 · Revision 1
- Added to Heist Feed
- Publisher date