CVE-2026-50158 (GCVE-0-2026-50158)
Vulnerability from cvelistv5 – Published: 2026-09-17 21:43 – Updated: 2026-09-17 21:43
VLAI
EPSS
VEX
Title
yutu: Arbitrary File Write via MCP `caption-download` Tool
Summary
yutu is an AI-powered toolkit for managing and growing YouTube channels. Prior to 0.10.9, the caption-download MCP tool accepts a caller-controlled file parameter through cmd/caption/download.go and passes it to Caption.Download() in pkg/caption/caption.go, where os.Create() creates or truncates that path without using the pkg.Root confinement boundary backed by YUTU_ROOT. A principal able to invoke caption-download, including a local HTTP client when the MCP server runs with its default authentication-disabled configuration, can write downloaded caption bytes to any path writable by the yutu process outside YUTU_ROOT. This can overwrite application files, configuration, shell startup files, logs, or data and can cause persistent code execution or denial of service depending on the selected writable target. Live caption retrieval also requires usable service credentials and an accessible caption identifier. This issue is fixed in version 0.10.9.
Severity
7.7 (High)
CWE
- CWE-73 - External Control of File Name or Path
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/eat-pray-ai/yutu/security/advi… | x_refsource_CONFIRM |
| https://github.com/eat-pray-ai/yutu/commit/87026c… | x_refsource_MISC |
| https://github.com/eat-pray-ai/yutu/releases/tag/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| eat-pray-ai | yutu |
Affected:
< 0.10.9-dev1
|
guessed |
{
"containers": {
"cna": {
"affected": [
{
"product": "yutu",
"vendor": "eat-pray-ai",
"versions": [
{
"status": "affected",
"version": "\u003c 0.10.9-dev1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "yutu is an AI-powered toolkit for managing and growing YouTube channels. Prior to 0.10.9, the caption-download MCP tool accepts a caller-controlled file parameter through cmd/caption/download.go and passes it to Caption.Download() in pkg/caption/caption.go, where os.Create() creates or truncates that path without using the pkg.Root confinement boundary backed by YUTU_ROOT. A principal able to invoke caption-download, including a local HTTP client when the MCP server runs with its default authentication-disabled configuration, can write downloaded caption bytes to any path writable by the yutu process outside YUTU_ROOT. This can overwrite application files, configuration, shell startup files, logs, or data and can cause persistent code execution or denial of service depending on the selected writable target. Live caption retrieval also requires usable service credentials and an accessible caption identifier. This issue is fixed in version 0.10.9."
}
],
"metrics": [
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-73",
"description": "CWE-73: External Control of File Name or Path",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-17T21:43:49.806Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/eat-pray-ai/yutu/security/advisories/GHSA-2c7f-fxww-6w6c",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/eat-pray-ai/yutu/security/advisories/GHSA-2c7f-fxww-6w6c"
},
{
"name": "https://github.com/eat-pray-ai/yutu/commit/87026c4eee1ed28775383807087343a750707bf3",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/eat-pray-ai/yutu/commit/87026c4eee1ed28775383807087343a750707bf3"
},
{
"name": "https://github.com/eat-pray-ai/yutu/releases/tag/v0.10.9",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/eat-pray-ai/yutu/releases/tag/v0.10.9"
}
],
"source": {
"advisory": "GHSA-2c7f-fxww-6w6c",
"discovery": "UNKNOWN"
},
"title": "yutu: Arbitrary File Write via MCP `caption-download` Tool"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-50158",
"datePublished": "2026-09-17T21:43:49.806Z",
"dateReserved": "2026-06-03T20:54:20.432Z",
"dateUpdated": "2026-09-17T21:43:49.806Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-50158\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-09-17T22:16:59.297\",\"lastModified\":\"2026-09-17T22:16:59.297\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"yutu is an AI-powered toolkit for managing and growing YouTube channels. Prior to 0.10.9, the caption-download MCP tool accepts a caller-controlled file parameter through cmd/caption/download.go and passes it to Caption.Download() in pkg/caption/caption.go, where os.Create() creates or truncates that path without using the pkg.Root confinement boundary backed by YUTU_ROOT. A principal able to invoke caption-download, including a local HTTP client when the MCP server runs with its default authentication-disabled configuration, can write downloaded caption bytes to any path writable by the yutu process outside YUTU_ROOT. This can overwrite application files, configuration, shell startup files, logs, or data and can cause persistent code execution or denial of service depending on the selected writable target. Live caption retrieval also requires usable service credentials and an accessible caption identifier. This issue is fixed in version 0.10.9.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"eat-pray-ai\",\"product\":\"yutu\",\"versions\":[{\"version\":\"\u003c 0.10.9-dev1\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H\",\"baseScore\":7.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-73\"}]}],\"references\":[{\"url\":\"https://github.com/eat-pray-ai/yutu/commit/87026c4eee1ed28775383807087343a750707bf3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/eat-pray-ai/yutu/releases/tag/v0.10.9\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/eat-pray-ai/yutu/security/advisories/GHSA-2c7f-fxww-6w6c\",\"source\":\"security-advisories@github.com\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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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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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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