UBUNTU-CVE-2026-44660 (CVE-2026-44660)
Vulnerability from osv_ubuntu – Published: 2026-05-27 21:16 – Updated: 2026-10-17 09:42 – Source website
VLAI
Details
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.
Severity
7.5 (High)
N/A (UNKNOWN)
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-pandas",
"binary_version": "0.13.1-2ubuntu2"
},
{
"binary_name": "python-pandas-lib",
"binary_version": "0.13.1-2ubuntu2"
},
{
"binary_name": "python3-pandas",
"binary_version": "0.13.1-2ubuntu2"
},
{
"binary_name": "python3-pandas-lib",
"binary_version": "0.13.1-2ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@0.13.1-2ubuntu2?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.12.0-2ubuntu1",
"0.13.1-2ubuntu1",
"0.13.1-2ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcollada2gltfconvert-dev",
"binary_version": "20140924-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "collada2gltf",
"purl": "pkg:deb/ubuntu/collada2gltf@20140924-3?arch=source\u0026distro=xenial"
},
"ranges": [
{
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],
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}
],
"versions": [
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]
},
{
"ecosystem_specific": {
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{
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},
{
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},
{
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},
{
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},
"package": {
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},
"ranges": [
{
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{
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"0.15.0-2ubuntu1",
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-ujson",
"binary_version": "1.33-1ubuntu0.1~esm2"
},
{
"binary_name": "python3-ujson",
"binary_version": "1.33-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "ujson",
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},
"ranges": [
{
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},
{
"ecosystem_specific": {
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{
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},
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},
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},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-pandas",
"binary_version": "0.22.0-4ubuntu1"
},
{
"binary_name": "python-pandas-lib",
"binary_version": "0.22.0-4ubuntu1"
},
{
"binary_name": "python3-pandas",
"binary_version": "0.22.0-4ubuntu1"
},
{
"binary_name": "python3-pandas-lib",
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}
]
},
"package": {
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"name": "pandas",
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},
"ranges": [
{
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],
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"0.22.0-2ubuntu1",
"0.22.0-3",
"0.22.0-4",
"0.22.0-4ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-ujson",
"binary_version": "1.35-2ubuntu0.1~esm1"
},
{
"binary_name": "python3-ujson",
"binary_version": "1.35-2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "ujson",
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},
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"1.35-2ubuntu0.1~esm1"
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},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-pandas",
"binary_version": "0.25.3+dfsg-7"
},
{
"binary_name": "python3-pandas-lib",
"binary_version": "0.25.3+dfsg-7"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@0.25.3+dfsg-7?arch=source\u0026distro=focal"
},
"ranges": [
{
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{
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],
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"0.23.3+dfsg-4ubuntu1",
"0.23.3+dfsg-4ubuntu5",
"0.23.3+dfsg-4ubuntu6",
"0.25.3+dfsg-4",
"0.25.3+dfsg-4build1",
"0.25.3+dfsg-7"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-ujson",
"binary_version": "1.35-4ubuntu0.1+esm1"
}
]
},
"package": {
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"name": "ujson",
"purl": "pkg:deb/ubuntu/ujson@1.35-4ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
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{
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],
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"1.35-3build1",
"1.35-3build2",
"1.35-4",
"1.35-4build1",
"1.35-4ubuntu0.1",
"1.35-4ubuntu0.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcollada2gltfconvert-dev",
"binary_version": "20140924-8"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "collada2gltf",
"purl": "pkg:deb/ubuntu/collada2gltf@20140924-8?arch=source\u0026distro=jammy"
},
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{
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"20140924-8"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-pandas",
"binary_version": "1.3.5+dfsg-3"
},
{
"binary_name": "python3-pandas-lib",
"binary_version": "1.3.5+dfsg-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@1.3.5+dfsg-3?arch=source\u0026distro=jammy"
},
"ranges": [
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"1.1.5+dfsg-2ubuntu1",
"1.3.5+dfsg-2",
"1.3.5+dfsg-2ubuntu1",
"1.3.5+dfsg-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-ujson",
"binary_version": "5.1.0-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "ujson",
"purl": "pkg:deb/ubuntu/ujson@5.1.0-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
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"5.1.0-1ubuntu0.1~esm1",
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]
},
{
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},
{
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"binary_version": "2.1.4+dfsg-7"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@2.1.4+dfsg-7?arch=source\u0026distro=noble"
},
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"1.5.3+dfsg-6",
"1.5.3+dfsg-6ubuntu1",
"1.5.3+dfsg-7ubuntu1",
"1.5.3+dfsg-10",
"2.1.4+dfsg-4ubuntu2",
"2.1.4+dfsg-7"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-ujson",
"binary_version": "5.9.0-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "ujson",
"purl": "pkg:deb/ubuntu/ujson@5.9.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
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"5.8.0-1build1",
"5.9.0-1",
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"5.9.0-1ubuntu0.1~esm1"
]
},
{
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{
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"binary_version": "2.2.3+dfsg-9"
},
{
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"package": {
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"package": {
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"name": "ujson",
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},
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},
{
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{
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},
{
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}
]
},
"package": {
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},
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{
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}
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},
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},
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{
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{
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},
{
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"binary_version": "2.3.3+dfsg-3ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@2.3.3+dfsg-3ubuntu1?arch=source\u0026distro=resolute"
},
"ranges": [
{
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],
"versions": [
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"2.3.3+dfsg-1ubuntu1",
"2.3.3+dfsg-3",
"2.3.3+dfsg-3ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-ujson",
"binary_version": "5.11.0-3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "ujson",
"purl": "pkg:deb/ubuntu/ujson@5.11.0-3ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
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{
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],
"type": "ECOSYSTEM"
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],
"versions": [
"5.10.0-1build2",
"5.10.0-1build3",
"5.11.0-3",
"5.11.0-3build1",
"5.11.0-3ubuntu0.1"
]
}
],
"aliases": [],
"details": "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.",
"id": "UBUNTU-CVE-2026-44660",
"modified": "2026-10-17T09:42:30Z",
"published": "2026-05-27T21:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-44660"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-44660"
},
{
"type": "REPORT",
"url": "https://github.com/ultrajson/ultrajson/commit/82af1d0ac01d09aa40c887b460d44b9d9f4bccd9"
},
{
"type": "REPORT",
"url": "https://github.com/ultrajson/ultrajson/releases/tag/5.12.1"
},
{
"type": "REPORT",
"url": "https://github.com/ultrajson/ultrajson/security/advisories/GHSA-c38f-wx89-p2xg"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-44660"
]
}
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