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vuln-cve/data/2026/88xxx/CVE-2026-88899.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-88899",
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"state": "PUBLISHED",
"assignerShortName": "VulnCheck",
"dateReserved": "2026-09-10T11:28:50.297Z",
"datePublished": "2026-09-10T15:28:51.729Z",
"dateUpdated": "2026-09-11T20:33:42.233Z"
},
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"shortName": "VulnCheck",
"dateUpdated": "2026-09-11T11:07:57.696Z"
},
"datePublic": "2026-09-09T00:00:00.000Z",
"title": "knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header",
"descriptions": [
{
"lang": "en",
"value": "knowns versions before 0.31.0 fail to properly validate the x-opencode-directory request header in the /api/opencode proxy endpoint. Remote attackers can supply arbitrary directory paths to execute file operations outside the project root on the host system."
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "External Control of File Name or Path",
"cweId": "CWE-73",
"type": "CWE"
}
]
}
],
"affected": [
{
"vendor": "knowns-dev",
"product": "knowns",
"defaultStatus": "unaffected",
"packageURL": "pkg:npm/knowns",
"versions": [
{
"version": "0",
"status": "affected",
"versionType": "semver",
"lessThan": "0.31.0"
},
{
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}
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"baseScore": 9.3,
"baseSeverity": "CRITICAL"
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"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL"
}
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],
"references": [
{
"url": "https://github.com/knowns-dev/knowns/security/advisories/GHSA-9h2q-r9fh-f98w",
"tags": [
"vendor-advisory"
],
"name": "GitHub Security Advisory (GHSA-9h2q-r9fh-f98w)"
},
{
"url": "https://github.com/knowns-dev/knowns/blob/v0.30.0/internal/server/server.go#L1283-L1296",
"tags": [
"technical-description"
]
},
{
"url": "https://github.com/knowns-dev/knowns/commit/37db0561b37b48b8bd035a417d7f1da6258ae657",
"tags": [
"patch"
]
},
{
"url": "https://github.com/knowns-dev/knowns/releases/tag/v0.31.0",
"tags": [
"release-notes"
],
"name": "knowns v0.31.0 Release Notes"
},
{
"name": "VulnCheck Advisory: knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/knowns-before-0.31.0-external-control-of-agent-working-directory-via-x-opencode-directory-header"
}
],
"credits": [
{
"lang": "en",
"value": "Tong Hoang Gia (uziii2208)",
"type": "finder"
}
],
"x_generator": {
"engine": "vulncheck-endgame"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-09-11T17:11:17.124340Z",
"id": "CVE-2026-88899",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"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": "2026-09-11T20:33:42.233Z"
}
}
]
}
}