DEBIAN-CVE-2026-44660
UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.12.1, when ujson.dump() writes to a file-like object and the write operation raises an exception, the serialized JSON string object is not decremented, leaking memory. Each failed write operation leaks the full size of the serialized payload. This vulnerability is fixed in 5.12.1.
DEBIAN-CVE-2026-44660
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-2026-44660
ujson
Source reference: /affected/0/package/name
- Affected versions
- 5.10.0-1
Source reference:
/affected/0/versions5.11.0-1Source reference:
/affected/0/versions5.11.0-2Source reference:
/affected/0/versions5.11.0-3Source reference:
/affected/0/versions5.13.0-1Source reference:
/affected/0/versions5.7.0-1Source reference:
/affected/0/versions5.8.0-1Source reference:
/affected/0/versions5.9.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
ujson
Source reference: /affected/1/package/name
- Affected versions
- 5.10.0-1
Source reference:
/affected/1/versions5.11.0-1Source reference:
/affected/1/versions5.11.0-2Source reference:
/affected/1/versions5.11.0-3Source reference:
/affected/1/versions5.13.0-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
ujson
Source reference: /affected/2/package/name
- Affected versions
- 5.10.0-1
Source reference:
/affected/2/versions5.11.0-1Source reference:
/affected/2/versions5.11.0-2Source reference:
/affected/2/versions5.11.0-3Source reference:
/affected/2/versions - Fixed versions
- 5.13.0-1
Source reference:
/affected/2/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"
}
]
}
],
"package": {
"name": "ujson",
"purl": "pkg:deb/debian/ujson?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"5.10.0-1",
"5.11.0-1",
"5.11.0-2",
"5.11.0-3",
"5.13.0-1",
"5.7.0-1",
"5.8.0-1",
"5.9.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44660.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "ujson",
"purl": "pkg:deb/debian/ujson?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"5.10.0-1",
"5.11.0-1",
"5.11.0-2",
"5.11.0-3",
"5.13.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44660.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.13.0-1"
}
]
}
],
"package": {
"name": "ujson",
"purl": "pkg:deb/debian/ujson?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"5.10.0-1",
"5.11.0-1",
"5.11.0-2",
"5.11.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44660.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57019 · Revision 1
- Added to Heist Feed
- Publisher date