High
collada2gltf, pandas and 1 more products — security advisory
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.
- Products
- collada2gltf, pandas, ujson
- Affected versions
- 0.12.0-2ubuntu1, 0.13.1-2ubuntu1, 0.13.1-2ubuntu2, 0.15.0-2, 0.15.0-2ubuntu1, 0.15.0-2ubuntu2, 0.17.1-3ubuntu2, 0.19.2-5.1ubuntu4, 0.22.0-2ubuntu1, 0.22.0-3, 0.22.0-4, 0.22.0-4ubuntu1, 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, 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, 1.33-1, 1.33-1build1, 1.33-1ubuntu0.1~esm2, 1.35-1build2, 1.35-2, 1.35-2ubuntu0.1~esm1, 1.35-3build1, 1.35-3build2, 1.35-4, 1.35-4build1, 1.35-4ubuntu0.1, 1.35-4ubuntu0.1+esm1, 1.5.3+dfsg-10, 1.5.3+dfsg-6, 1.5.3+dfsg-6ubuntu1, 1.5.3+dfsg-7ubuntu1, 2.1.4+dfsg-4ubuntu2, 2.1.4+dfsg-7, 2.2.3+dfsg-8build1, 2.2.3+dfsg-9, 2.3.3+dfsg-1ubuntu1, 2.3.3+dfsg-3, 2.3.3+dfsg-3ubuntu1, 2.3.3+dfsg-3ubuntu3, 20140924-3, 20140924-4, 20140924-7build1, 20140924-8, 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, 5.10.0-1build2, 5.10.0-1build3, 5.10.0-1ubuntu0.1, 5.11.0-3, 5.11.0-3build1, 5.11.0-3ubuntu0.1, 5.13.0-1, 5.8.0-1, 5.8.0-1build1, 5.9.0-1, 5.9.0-1build1, 5.9.0-1ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-44660
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:13 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-44660
pandas
Fixed versions: Not specified
collada2gltf
Fixed versions: Not specified
pandas
Fixed versions: Not specified
ujson
Fixed versions: Not specified
collada2gltf
Fixed versions: Not specified
pandas
Fixed versions: Not specified
ujson
Fixed versions: Not specified
pandas
Fixed versions: Not specified
ujson
Fixed versions: Not specified
collada2gltf
Fixed versions: Not specified
pandas
Fixed versions: Not specified
ujson
Fixed versions: Not specified
pandas
Fixed versions: Not specified
ujson
Fixed versions: Not specified
pandas
Fixed versions: Not specified
ujson
Fixed versions: Not specified
pandas
Fixed versions: Not specified
ujson
Fixed versions: Not specified
pandas
Fixed versions: Not specified
ujson
Fixed versions: Not specified
Complete source record
{
"id": "8914882f3ee43f56b3efd4d854a4e56e2516f75e973ca190110fca3db9172bf6",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-44660",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-44660",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-44660",
"products": [
{
"name": {
"value": "pandas",
"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "0.12.0-2ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "0.13.1-2ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "0.13.1-2ubuntu2",
"evidence": "/affected/0/versions"
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},
{
"name": {
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{
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{
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{
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"evidence": "/affected/2/versions"
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{
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{
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}
]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
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{
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"evidence": "/affected/3/versions"
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{
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{
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{
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{
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"evidence": "/affected/5/versions"
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{
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},
{
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{
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]
},
{
"name": {
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},
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"affected_versions": [
{
"value": "1.35-1build2",
"evidence": "/affected/6/versions"
},
{
"value": "1.35-2",
"evidence": "/affected/6/versions"
},
{
"value": "1.35-2ubuntu0.1~esm1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
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},
"prerequisites": [],
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"affected_versions": [
{
"value": "0.23.3+dfsg-4ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "0.23.3+dfsg-4ubuntu5",
"evidence": "/affected/7/versions"
},
{
"value": "0.23.3+dfsg-4ubuntu6",
"evidence": "/affected/7/versions"
},
{
"value": "0.25.3+dfsg-4",
"evidence": "/affected/7/versions"
},
{
"value": "0.25.3+dfsg-4build1",
"evidence": "/affected/7/versions"
},
{
"value": "0.25.3+dfsg-7",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "ujson",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.35-3build1",
"evidence": "/affected/8/versions"
},
{
"value": "1.35-3build2",
"evidence": "/affected/8/versions"
},
{
"value": "1.35-4",
"evidence": "/affected/8/versions"
},
{
"value": "1.35-4build1",
"evidence": "/affected/8/versions"
},
{
"value": "1.35-4ubuntu0.1",
"evidence": "/affected/8/versions"
},
{
"value": "1.35-4ubuntu0.1+esm1",
"evidence": "/affected/8/versions"
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]
},
{
"name": {
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"evidence": "/affected/9/package/name"
},
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{
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"evidence": "/affected/9/versions"
},
{
"value": "20140924-8",
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}
]
},
{
"name": {
"value": "pandas",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
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{
"value": "1.1.5+dfsg-2",
"evidence": "/affected/10/versions"
},
{
"value": "1.1.5+dfsg-2ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "1.3.5+dfsg-2",
"evidence": "/affected/10/versions"
},
{
"value": "1.3.5+dfsg-2ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "1.3.5+dfsg-3",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "ujson",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "4.0.2-1",
"evidence": "/affected/11/versions"
},
{
"value": "4.0.2-1build1",
"evidence": "/affected/11/versions"
},
{
"value": "4.2.0-1",
"evidence": "/affected/11/versions"
},
{
"value": "5.1.0-1",
"evidence": "/affected/11/versions"
},
{
"value": "5.1.0-1build1",
"evidence": "/affected/11/versions"
},
{
"value": "5.1.0-1ubuntu0.1~esm1",
"evidence": "/affected/11/versions"
},
{
"value": "5.1.0-1ubuntu0.1~esm2",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
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"evidence": "/affected/12/package/name"
},
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"affected_versions": [
{
"value": "1.5.3+dfsg-6",
"evidence": "/affected/12/versions"
},
{
"value": "1.5.3+dfsg-6ubuntu1",
"evidence": "/affected/12/versions"
},
{
"value": "1.5.3+dfsg-7ubuntu1",
"evidence": "/affected/12/versions"
},
{
"value": "1.5.3+dfsg-10",
"evidence": "/affected/12/versions"
},
{
"value": "2.1.4+dfsg-4ubuntu2",
"evidence": "/affected/12/versions"
},
{
"value": "2.1.4+dfsg-7",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
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"evidence": "/affected/13/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "5.8.0-1",
"evidence": "/affected/13/versions"
},
{
"value": "5.8.0-1build1",
"evidence": "/affected/13/versions"
},
{
"value": "5.9.0-1",
"evidence": "/affected/13/versions"
},
{
"value": "5.9.0-1build1",
"evidence": "/affected/13/versions"
},
{
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}
]
},
{
"name": {
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"evidence": "/affected/14/package/name"
},
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{
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}
]
},
{
"name": {
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"evidence": "/affected/15/package/name"
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{
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{
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]
},
{
"name": {
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},
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"name": {
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{
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},
{
"name": {
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{
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{
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{
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{
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-44660",
"aliases": [
"UBUNTU-CVE-2026-44660"
],
"metrics": [
{
"type": "CVSS_V4",
"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"
},
{
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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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},
"ecosystem_specific": {
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},
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"0.22.0-2ubuntu1",
"0.22.0-3",
"0.22.0-4",
"0.22.0-4ubuntu1"
],
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},
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},
{
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},
{
"binary_name": "python3-pandas",
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{
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],
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
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"1.35-2",
"1.35-2ubuntu0.1~esm1"
],
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},
"ecosystem_specific": {
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{
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}
},
{
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{
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"modified": "2026-10-17T12:58:21.125620806Z",
"provider": "osv",
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"references": [
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"https://www.cve.org/CVERecord?id=CVE-2026-44660",
"https://github.com/ultrajson/ultrajson/commit/82af1d0ac01d09aa40c887b460d44b9d9f4bccd9",
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"evidence": "/upstream"
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"source_id": "core-osv",
"document_id": 358582,
"published_at": "2026-05-27T21:16:00+00:00"
}