ubuntu-cve-2026-44660
Vulnerability from osv_ubuntu
Published
2026-05-27 21:16
Modified
2026-06-04 11:01
Summary
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": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"20140924-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-pandas",
"binary_version": "0.17.1-3ubuntu2"
},
{
"binary_name": "python-pandas-lib",
"binary_version": "0.17.1-3ubuntu2"
},
{
"binary_name": "python3-pandas",
"binary_version": "0.17.1-3ubuntu2"
},
{
"binary_name": "python3-pandas-lib",
"binary_version": "0.17.1-3ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@0.17.1-3ubuntu2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.15.0-2",
"0.15.0-2ubuntu1",
"0.15.0-2ubuntu2",
"0.17.1-3ubuntu2"
]
},
{
"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",
"purl": "pkg:deb/ubuntu/ujson@1.33-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.33-1",
"1.33-1build1",
"1.33-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcollada2gltfconvert-dev",
"binary_version": "20140924-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "collada2gltf",
"purl": "pkg:deb/ubuntu/collada2gltf@20140924-4?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"20140924-4"
]
},
{
"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",
"binary_version": "0.22.0-4ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@0.22.0-4ubuntu1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.19.2-5.1ubuntu4",
"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",
"purl": "pkg:deb/ubuntu/ujson@1.35-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.35-1build2",
"1.35-2",
"1.35-2ubuntu0.1~esm1"
]
},
{
"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": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "ujson",
"purl": "pkg:deb/ubuntu/ujson@1.35-4ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"20140924-7build1",
"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": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.5+dfsg-2",
"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": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.2-1",
"4.0.2-1build1",
"4.2.0-1",
"5.1.0-1",
"5.1.0-1build1",
"5.1.0-1ubuntu0.1~esm1",
"5.1.0-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-pandas",
"binary_version": "2.1.4+dfsg-7"
},
{
"binary_name": "python3-pandas-lib",
"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"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.8.0-1",
"5.8.0-1build1",
"5.9.0-1",
"5.9.0-1build1",
"5.9.0-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-pandas",
"binary_version": "2.2.3+dfsg-9"
},
{
"binary_name": "python3-pandas-lib",
"binary_version": "2.2.3+dfsg-9"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@2.2.3+dfsg-9?arch=source\u0026distro=questing"
},
"ranges": [
{
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{
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],
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}
],
"versions": [
"2.2.3+dfsg-8build1",
"2.2.3+dfsg-9"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-ujson",
"binary_version": "5.10.0-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "ujson",
"purl": "pkg:deb/ubuntu/ujson@5.10.0-1ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.10.0-1build2",
"5.10.0-1ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-pandas",
"binary_version": "2.3.3+dfsg-3ubuntu1"
},
{
"binary_name": "python3-pandas-lib",
"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": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.3+dfsg-9",
"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": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "2026-06-04T11:01:21Z",
"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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