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vuln-cve/data/2026/54xxx/CVE-2026-54911.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-54911",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-06-16T13:49:33.556Z",
"datePublished": "2026-06-22T20:53:07.019Z",
"dateUpdated": "2026-06-23T14:20:13.488Z"
},
"containers": {
"cna": {
"title": "UltraJSON: Malformed/Truncated UTF-8 Accepted and Silently Rewritten in ujson.dumps()",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"lang": "en",
"description": "CWE-20: Improper Input Validation",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
}
}
],
"references": [
{
"name": "https://github.com/ultrajson/ultrajson/security/advisories/GHSA-3j69-69wj-xqx2",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/ultrajson/ultrajson/security/advisories/GHSA-3j69-69wj-xqx2"
},
{
"name": "https://github.com/ultrajson/ultrajson/commit/169eaf36b1116fece5034ee79a7a0ef3f6deedcf",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ultrajson/ultrajson/commit/169eaf36b1116fece5034ee79a7a0ef3f6deedcf"
},
{
"name": "https://github.com/ultrajson/ultrajson/releases/tag/5.13.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ultrajson/ultrajson/releases/tag/5.13.0"
}
],
"affected": [
{
"vendor": "ultrajson",
"product": "ultrajson",
"versions": [
{
"version": "< 5.13.0",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-06-22T20:53:07.019Z"
},
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"source": {
"advisory": "GHSA-3j69-69wj-xqx2",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-06-23T14:19:57.855154Z",
"id": "CVE-2026-54911",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-06-23T14:20:13.488Z"
}
}
]
}
}