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vuln-cve/data/2026/27xxx/CVE-2026-27607.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-27607",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-02-20T19:43:14.602Z",
"datePublished": "2026-02-25T02:10:28.086Z",
"dateUpdated": "2026-02-25T20:06:03.487Z"
},
"containers": {
"cna": {
"title": "RustFS's Missing Post Policy Validation leads to Arbitrary Object Write",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"lang": "en",
"description": "CWE-20: Improper Input Validation",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-863",
"lang": "en",
"description": "CWE-863: Incorrect Authorization",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
}
}
],
"references": [
{
"name": "https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p"
}
],
"affected": [
{
"vendor": "rustfs",
"product": "rustfs",
"versions": [
{
"version": ">= 1.0.0-alpha.56, < 1.0.0-alpha.83",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-02-25T02:10:28.086Z"
},
"descriptions": [
{
"lang": "en",
"value": "RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads (PostObject), allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads exceeding size limits, uploads to arbitrary object keys, and content-type spoofing, potentially leading to storage exhaustion, unauthorized data access, and security bypasses. Version 1.0.0-alpha.83 fixes the issue."
}
],
"source": {
"advisory": "GHSA-w5fh-f8xh-5x3p",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-02-25T20:05:51.123736Z",
"id": "CVE-2026-27607",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-02-25T20:06:03.487Z"
}
}
]
}
}