UBUNTU-CVE-2026-54911 (CVE-2026-54911)
Vulnerability from osv_ubuntu – Published: 2026-06-22 22:16 – Updated: 2026-06-24 09:03 – Source website
VLAI
Details
UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.13.0, ujson.dumps() (or ujson.dump() or ujson.encode()) have a reject_bytes=False option. When set, they may accept malformed or truncated UTF-8 byte sequences, silently rewriting them into different Unicode characters instead of rejecting them. This leads to input validation bypass and data integrity issues. This vulnerability is fixed in 5.13.0.
Severity
6.5 (Medium)
N/A (UNKNOWN)
{
"affected": [
{
"ecosystem_specific": {
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{
"binary_name": "python-pandas",
"binary_version": "0.13.1-2ubuntu2"
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{
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},
{
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},
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]
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},
"ranges": [
{
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],
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}
],
"versions": [
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"0.13.1-2ubuntu2"
]
},
{
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{
"binary_name": "libcollada2gltfconvert-dev",
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}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
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},
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{
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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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},
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{
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},
{
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{
"binary_name": "python-ujson",
"binary_version": "1.33-1ubuntu0.1~esm2"
},
{
"binary_name": "python3-ujson",
"binary_version": "1.33-1ubuntu0.1~esm2"
}
]
},
"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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},
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],
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"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": {
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"name": "pandas",
"purl": "pkg:deb/ubuntu/pandas@0.22.0-4ubuntu1?arch=source\u0026distro=bionic"
},
"ranges": [
{
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}
],
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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": {
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"name": "ujson",
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},
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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-4ubuntu5",
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"0.25.3+dfsg-4",
"0.25.3+dfsg-4build1",
"0.25.3+dfsg-7"
]
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{
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{
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},
"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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],
"versions": [
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"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",
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},
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"20140924-8"
]
},
{
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{
"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"
},
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}
],
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"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",
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},
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"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-6ubuntu1",
"1.5.3+dfsg-7ubuntu1",
"1.5.3+dfsg-10",
"2.1.4+dfsg-4ubuntu2",
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]
},
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}
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},
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"5.9.0-1ubuntu0.1~esm1"
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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"
},
{
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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"
},
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{
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],
"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": {
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"name": "ujson",
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},
"ranges": [
{
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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 5.13.0, ujson.dumps() (or ujson.dump() or ujson.encode()) have a reject_bytes=False option. When set, they may accept malformed or truncated UTF-8 byte sequences, silently rewriting them into different Unicode characters instead of rejecting them. This leads to input validation bypass and data integrity issues. This vulnerability is fixed in 5.13.0.",
"id": "UBUNTU-CVE-2026-54911",
"modified": "2026-06-24T09:03:12Z",
"published": "2026-06-22T22:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-54911"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-54911"
},
{
"type": "REPORT",
"url": "https://github.com/ultrajson/ultrajson/commit/169eaf36b1116fece5034ee79a7a0ef3f6deedcf"
},
{
"type": "REPORT",
"url": "https://github.com/ultrajson/ultrajson/releases/tag/5.13.0"
},
{
"type": "REPORT",
"url": "https://github.com/ultrajson/ultrajson/security/advisories/GHSA-3j69-69wj-xqx2"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-54911"
]
}
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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