{"id":"GHSA-9gfj-28hw-jchp","revision":null,"records":[{"revision":"cbf55c19032644318de3dcb2f2670f9c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-86439","aliases":[],"title":"knowns before 0.30.0 Path Traversal via MCP doc and memory tools","description":"knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory traversal sequences to access arbitrary Markdown files accessible to the server process.","state":0,"publishedAt":"2026-09-07T23:03:16.548+00:00","modifiedAt":"2026-09-24T14:21:21.1+00:00","affected":[{"ecosystem":"Vendor product","name":"knowns","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"knowns-dev\",\n                    \"product\": \"knowns\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/knowns\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"0.30.0\"\n                        },\n                        {\n                            \"version\": \"0.30.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/knowns-dev/knowns/security/advisories/GHSA-9gfj-28hw-jchp","https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/doc_store.go#L124-L129","https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/memory_store.go#L203-L211","https://github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278c1a17db10ed4e","https://github.com/knowns-dev/knowns/releases/tag/v0.30.0","https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-mcp-doc-and-memory-tools"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-86439","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-86439","identifiers":["CVE-2026-86439"]},"retained":false,"historicalAffected":[]},{"revision":"67b12ca2221044d4a80e8843539679dc","observedAt":"2026-11-11T17:02:38.188+00:00","statement":{"source":"euvd","id":"EUVD-2026-72555","aliases":["CVE-2026-86439","GHSA-qjrq-cvv4-3g9w","GHSA-9gfj-28hw-jchp"],"title":"knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory tr…","description":"knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. 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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-2026-72555","identifiers":["EUVD-2026-72555","CVE-2026-86439","GHSA-qjrq-cvv4-3g9w","GHSA-9gfj-28hw-jchp"]},"retained":false,"historicalAffected":[]},{"revision":"dd391f6b9edd4a7f83456333c6fce757","observedAt":"2026-10-25T16:19:16.24+00:00","statement":{"source":"nvd","id":"CVE-2026-86439","aliases":[],"title":"knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory tr…","description":"knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory traversal sequences to access arbitrary Markdown files accessible to the server process.","state":0,"publishedAt":"2026-09-07T23:16:53.297+00:00","modifiedAt":"2026-09-08T19:56:50.95+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · disclosure@vulncheck.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1 · disclosure@vulncheck.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/doc_store.go#L124-L129","https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/memory_store.go#L203-L211","https://github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278c1a17db10ed4e","https://github.com/knowns-dev/knowns/releases/tag/v0.30.0","https://github.com/knowns-dev/knowns/security/advisories/GHSA-9gfj-28hw-jchp","https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-mcp-doc-and-memory-tools"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86439","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-22"],"productCriteria":[],"sourceDates":{"published":"2026-09-07T23:16:53.297","lastModified":"2026-09-08T19:56:50.950"},"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-2026-86439","identifiers":["CVE-2026-86439"]},"retained":false,"historicalAffected":[]},{"revision":"c1528f6e5aa24bffa6c8ad9679775247","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-9gfj-28hw-jchp","aliases":["CVE-2026-86439"],"title":"Knowns Unrestricted Path Traversal leading to out-of-bounds arbitrary .md file read, write, and deletion in MCP Docs + Memory Tools","description":"## Overview\n\nVerified. Multiple **Unrestricted Path Traversal** vulnerabilities exist in the Knowns MCP `docs` and `memory` tools, allowing arbitrary file read, write, and deletion operations outside the project sandbox. The storage layer functions (`Get`, `Create`, `Update`, `Rename`, `Delete`) in both `doc_store.go` and `memory_store.go` concatenate user-controlled paths with `filepath.Join()` without any containment validation. \n\nAdditionally, the `docs.update` action with a `newPath` parameter performs a file deletion via `Rename()`, but is classified as `CapWrite` in the permission registry rather than `CapDelete`. This allows an attacker with a `read-write-no-delete` preset to bypass deletion restrictions and destroy arbitrary files outside the project root.\n\n## Affected paths\n\n| File Path | Role | Vulnerability & Execution Impact |\n| :--- | :--- | :--- |\n| **`internal/storage/doc_store.go`** | Vulnerable Sink (Docs) | **Path Traversal in File Operations (CWE-22):** `Get()`, `Create()`, `Update()`, `Rename()`, `Delete()` join user-controlled `path` with `filepath.Join(ds.docsDir(), ...)` without validating path containment. |\n| **`internal/storage/memory_store.go`** | Vulnerable Sink (Memory) | **Path Traversal in Memory Operations (CWE-22):** `GetInLayer()`, `Create()`, `Update()`, `Delete()` join user-controlled `id` with `filepath.Join(dir, models.MemoryFileName(id))` without validation. |\n| **`internal/mcp/handlers/doc.go`** | Pass-Through Handler | **Unsanitized Input Propagation:** MCP handlers pass user-supplied `path`, `folder`, `newPath` directly to storage layer without sanitization. |\n| **`internal/mcp/handlers/memory.go`** | Pass-Through Handler | **Unsanitized Input Propagation:** MCP handlers pass user-supplied `id` directly to storage layer without sanitization. |\n| **`internal/permissions/registry.go`** | Authorization Bypass | **Capability Misclassification (CWE-863):** `docs.update` with `newPath` performs file deletion but is classified as `CapWrite`, bypassing `CapDelete` restrictions. |\n\n## Root Cause\n\n### Missing Path Containment in DocStore\n\nIn `internal/storage/doc_store.go`, all file operations use `filepath.Join()` to construct absolute paths without validating that the resolved path remains within `docsDir()`:\n\n```go\n// Get retrieves a doc by its relative path (without .md extension).\nfunc (ds *DocStore) Get(path string) (*models.Doc, error) {\n    path = strings.TrimPrefix(path, \"/\")\n    path = strings.TrimSuffix(path, \".md\")\n\n    // VULNERABLE: No containment check\n    absPath := filepath.Join(ds.docsDir(), filepath.FromSlash(path)+\".md\")\n    if _, err := os.Stat(absPath); err == nil {\n        // ...\n        return ds.parseFile(absPath, path, folder, false, \"\")\n    }\n    // ...\n}\n\n// Create writes a new doc to .knowns/docs/{path}.md.\nfunc (ds *DocStore) Create(doc *models.Doc) error {\n    if doc.Path == \"\" {\n        return fmt.Errorf(\"doc path is required\")\n    }\n    // VULNERABLE: No containment check\n    absPath := filepath.Join(ds.docsDir(), filepath.FromSlash(doc.Path)+\".md\")\n    if err := os.MkdirAll(filepath.Dir(absPath), 0755); err != nil {\n        return fmt.Errorf(\"create doc dir: %w\", err)\n    }\n    return ds.writeFile(absPath, doc)\n}\n\n// Rename rewrites a doc to a new path and removes the old file.\nfunc (ds *DocStore) Rename(oldPath string, doc *models.Doc) error {\n    // ...\n    oldAbsPath := filepath.Join(ds.docsDir(), filepath.FromSlash(strings.TrimSuffix(oldPath, \".md\"))+\".md\")\n    newAbsPath := filepath.Join(ds.docsDir(), filepath.FromSlash(strings.TrimSuffix(doc.Path, \".md\"))+\".md\")\n    // ...\n    if err := ds.writeFile(newAbsPath, doc); err != nil {\n        return err\n    }\n    if oldAbsPath != newAbsPath {\n        // VULNERABLE: Deletes file at oldAbsPath (can be outside docsDir)\n        if err := os.Remove(oldAbsPath); err != nil && !os.IsNotExist(err) {\n            return err\n        }\n    }\n    return nil\n}\n\n// Delete removes a doc file.\nfunc (ds *DocStore) Delete(path string) error {\n    path = strings.TrimSuffix(path, \".md\")\n    // VULNERABLE: No containment check\n    absPath := filepath.Join(ds.docsDir(), filepath.FromSlash(path)+\".md\")\n    return os.Remove(absPath)\n}\n```\n\n**Critical Flaws:**\n- `filepath.Join` resolves `../` sequences natively\n- No post-Join prefix check (e.g., `strings.HasPrefix(absPath, ds.docsDir())`)\n- No rejection of absolute paths or path traversal sequences\n- `Rename()` performs file deletion via `os.Remove(oldAbsPath)`, which can target files outside the docs directory\n\n### Missing Path Containment in MemoryStore\n\nIn `internal/storage/memory_store.go`, memory operations similarly lack path validation:\n\n```go\n// GetInLayer retrieves a memory entry by ID from a specific layer only.\nfunc (ms *MemoryStore) GetInLayer(id, layer string) (*models.MemoryEntry, error) {\n    // ...\n    dir, err := ms.dirForLayer(layer)\n    if err != nil {\n        return nil, err\n    }\n    // VULNERABLE: No containment check for id containing \"../\"\n    absPath := filepath.Join(dir, models.MemoryFileName(id))\n    if _, err := os.Stat(absPath); err != nil {\n        return nil, fmt.Errorf(\"memory %q not found in %s layer\", id, layer)\n    }\n    return ms.parseFile(absPath, layer)\n}\n\n// Create writes a new memory entry to the appropriate layer directory.\nfunc (ms *MemoryStore) Create(entry *models.MemoryEntry) error {\n    // ...\n    dir, err := ms.dirForLayer(entry.Layer)\n    if err != nil {\n        return err\n    }\n    if err := os.MkdirAll(dir, 0755); err != nil {\n        return fmt.Errorf(\"create memory dir: %w\", err)\n    }\n\n    // VULNERABLE: No containment check for entry.ID containing \"../\"\n    absPath := filepath.Join(dir, models.MemoryFileName(entry.ID))\n    return atomicWrite(absPath, []byte(renderMemory(entry)))\n}\n\n// Delete removes a memory entry by ID.\nfunc (ms *MemoryStore) Delete(id string) error {\n    // ...\n    filename := models.MemoryFileName(id)\n\n    dirs := []string{ms.projectDir(), ms.globalDir()}\n    for _, dir := range dirs {\n        // VULNERABLE: No containment check\n        absPath := filepath.Join(dir, filename)\n        if _, err := os.Stat(absPath); err == nil {\n            return os.Remove(absPath)\n        }\n    }\n\n    return fmt.Errorf(\"memory %q not found\", id)\n}\n```\n\n### Authorization Bypass via Rename-as-Delete\n\nIn `internal/mcp/handlers/doc.go`, the `handleDocUpdate()` function accepts a `newPath` parameter that triggers a rename operation:\n\n```go\nfunc handleDocUpdate(getStore func() *storage.Store, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {\n    // ...\n    if v, ok := stringArg(args, \"newPath\"); ok && strings.TrimSpace(v) != \"\" {\n        doc.Path = strings.Trim(strings.TrimSuffix(v, \".md\"), \"/\")\n    }\n    // ...\n    if oldPath != doc.Path {\n        if err := store.Docs.Rename(oldPath, doc); err != nil {\n            return errFailed(\"rename doc\", err)\n        }\n        // ...\n    }\n    // ...\n}\n```\n\nThe `Rename()` function in `doc_store.go` performs file deletion:\n\n```go\nif oldAbsPath != newAbsPath {\n    if err := os.Remove(oldAbsPath); err != nil && !os.IsNotExist(err) {\n        return err\n    }\n}\n```\n\nHowever, in `internal/permissions/registry.go`, `docs.update` is classified as `CapWrite`:\n\n```go\n\"docs.update\":  {Capability: CapWrite, Target: TargetDoc, Risk: RiskMedium},\n```\n\nThis allows an attacker with a `read-write-no-delete` preset (which permits `CapWrite` but denies `CapDelete`) to delete files by using `docs.update` with a `newPath` parameter.\n\n## Attack Vector\n\n| Phase | Request / Action | Effect |\n| :--- | :--- | :--- |\n| **1. Arbitrary File Read** | `docs.get` with `path=\"../../../victim/secret\"` | Server reads file outside project root via path traversal in `DocStore.Get()`. |\n| **2. Arbitrary File Write** | `docs.create` with `folder=\"../../../victim\"` | Server writes file outside project root via path traversal in `DocStore.Create()`. |\n| **3. Arbitrary File Delete** | `docs.update` with `path=\"../outside/secret.md\"` and `newPath=\"../../../victim/renamed.md\"` | Server deletes file outside project root via path traversal in `DocStore.Rename()`. Bypasses `CapDelete` restriction because `docs.update` is classified as `CapWrite`. |\n| **4. Memory File Read/Write** | `memory.update` with `id=\"x/../../../../victim/secret\"` | Server reads and overwrites file outside project root via path traversal in `MemoryStore.Update()`. |\n\n## Analysis\n\n### Classic Path Traversal Pattern\n\nBoth `DocStore` and `MemoryStore` follow the same vulnerable pattern: user-controlled input is concatenated with a base directory using `filepath.Join()`, then passed directly to file system operations (`os.ReadFile`, `os.WriteFile`, `os.Remove`, `os.Stat`) without any validation.\n\n```go\nabsPath := filepath.Join(baseDir, filepath.FromSlash(userInput))\n// No containment check: strings.HasPrefix(absPath, baseDir)\n// No rejection of \"..\" or absolute paths\n```\n\n`filepath.Join` resolves `../` sequences, allowing attackers to escape the intended directory:\n- Input: `\"../../../etc/passwd\"`\n- Result: `/project/.knowns/docs/../../../etc/passwd` → `/etc/passwd`\n\n### Rename-as-Delete Authorization Bypass\n\nThe `Rename()` function performs two operations:\n1. Write the file to the new location (`newAbsPath`)\n2. Delete the file from the old location (`oldAbsPath`)\n\nBoth paths are vulnerable to traversal. An attacker can:\n- Set `path` to a file outside the project (e.g., `\"../../../victim/target.md\"`)\n- Set `newPath` to another location outside the project\n- The `Rename()` function will delete the file at `path` (outside the project)\n\nBecause `docs.update` is classified as `CapWrite` rather than `CapDelete`, this operation bypasses deletion restrictions in `read-write-no-delete` presets.\n\n### Compounding Factor - Unauthenticated Access\n\nDue to the previously identified **Auth Bypass** vulnerability, all MCP tools are accessible without credentials when the server is started without a password, making this a zero-credential attack.\n\n## Fix\n\n*Patch is available right now at [New Release](https://github.com/knowns-dev/knowns/releases).*","state":0,"publishedAt":"2026-09-25T19:32:05+00:00","modifiedAt":"2026-09-25T19:45:09.7141305+00:00","affected":[{"ecosystem":"npm","name":"knowns","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.30.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/knowns-dev/knowns/security/advisories/GHSA-9gfj-28hw-jchp","https://nvd.nist.gov/vuln/detail/CVE-2026-86439","https://github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278c1a17db10ed4e","https://github.com/knowns-dev/knowns","https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/doc_store.go#L124-L129","https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/memory_store.go#L203-L211","https://github.com/knowns-dev/knowns/releases/tag/v0.30.0","https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-mcp-doc-and-memory-tools"],"sourceUrl":"https://github.com/advisories/GHSA-9gfj-28hw-jchp","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-9gfj-28hw-jchp","identifiers":["GHSA-9gfj-28hw-jchp","CVE-2026-86439"]},"retained":false,"historicalAffected":[]},{"revision":"c0903d45777a40b883317c9dfacd734d","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-qjrq-cvv4-3g9w","aliases":[],"title":"Duplicate Advisory: Knowns Unrestricted Path Traversal leading to out-of-bounds arbitrary .md file read, write, and deletion in MCP Docs + Memory Tools","description":"## Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-9gfj-28hw-jchp. This link is maintained to preserve external references.\n\n## Original Advisory\n\nknowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory traversal sequences to access arbitrary Markdown files accessible to the server process.","state":2,"publishedAt":"2026-09-08T00:30:22+00:00","modifiedAt":"2026-09-25T17:30:06.0835976+00:00","affected":[{"ecosystem":"npm","name":"knowns","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":null,"severity":null},{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/knowns-dev/knowns/security/advisories/GHSA-9gfj-28hw-jchp","https://nvd.nist.gov/vuln/detail/CVE-2026-86439","https://github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278c1a17db10ed4e","https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/doc_store.go#L124-L129","https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/storage/memory_store.go#L203-L211","https://github.com/knowns-dev/knowns/releases/tag/v0.30.0","https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-mcp-doc-and-memory-tools"],"sourceUrl":"https://github.com/advisories/GHSA-qjrq-cvv4-3g9w","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-qjrq-cvv4-3g9w","identifiers":["GHSA-qjrq-cvv4-3g9w"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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