diff --git a/.changeset/stupid-lobsters-own.md b/.changeset/stupid-lobsters-own.md
new file mode 100644
index 00000000000..e540a1e1959
--- /dev/null
+++ b/.changeset/stupid-lobsters-own.md
@@ -0,0 +1,5 @@
+---
+"app-builder-lib": patch
+---
+
+fix: detecting workspace root for calculating whether a relative file is within the project directory due to monorepo workspaces having `process.cwd()` returning the subpackage instead of monorepo root
diff --git a/packages/app-builder-lib/package.json b/packages/app-builder-lib/package.json
index 1322b70ed95..9550b43ac1e 100644
--- a/packages/app-builder-lib/package.json
+++ b/packages/app-builder-lib/package.json
@@ -66,6 +66,7 @@
     "dotenv-expand": "^11.0.6",
     "ejs": "^3.1.8",
     "electron-publish": "workspace:*",
+    "find-up": "^5.0.0",
     "fs-extra": "^10.1.0",
     "hosted-git-info": "^4.1.0",
     "isbinaryfile": "^5.0.0",
@@ -104,6 +105,7 @@
     "@babel/preset-react": "7.24.7",
     "@types/debug": "4.1.7",
     "@types/ejs": "3.1.0",
+    "@types/find-up": "^4.0.2",
     "@types/hosted-git-info": "3.0.2",
     "@types/js-yaml": "4.0.3",
     "@types/plist": "3.0.5",
diff --git a/packages/app-builder-lib/src/asar/asarUtil.ts b/packages/app-builder-lib/src/asar/asarUtil.ts
index fcdca3ac8a7..93d03d54298 100644
--- a/packages/app-builder-lib/src/asar/asarUtil.ts
+++ b/packages/app-builder-lib/src/asar/asarUtil.ts
@@ -9,6 +9,8 @@ import { PlatformPackager } from "../platformPackager"
 import { ResolvedFileSet, getDestinationPath } from "../util/appFileCopier"
 import { detectUnpackedDirs } from "./unpackDetector"
 import { Readable } from "stream"
+import * as findUp from "find-up"
+import { readdir } from "fs/promises"
 
 /** @internal */
 export class AsarPackager {
@@ -143,8 +145,9 @@ export class AsarPackager {
       return { path: destination, streamGenerator, unpacked, type: "file", stat: { mode: stat.mode, size } }
     }
 
+    const rootDir = (await findWorkspaceRoot(fileSet.src)) ?? fileSet.src
     const realPathFile = await fs.realpath(file)
-    const realPathRelative = path.relative(fileSet.src, realPathFile)
+    const realPathRelative = path.relative(rootDir, realPathFile)
     const isOutsidePackage = realPathRelative.startsWith("..")
     if (isOutsidePackage) {
       log.error({ source: log.filePath(file), realPathFile: log.filePath(realPathFile) }, `unable to copy, file is symlinked outside the package`)
@@ -159,7 +162,7 @@ export class AsarPackager {
     }
 
     // not a symlink, stream directly
-    if (file === realPathFile) {
+    if (!stat.isSymbolicLink()) {
       return {
         ...config,
         type: "file",
@@ -231,3 +234,33 @@ export class AsarPackager {
     }
   }
 }
+
+export async function findWorkspaceRoot(startDir: string): Promise<string | undefined> {
+  const packageJson = "package.json"
+  const WORKSPACE_MARKERS = ["pnpm-workspace.yaml", "lerna.json", "nx.json", "turbo.json", ".yarnrc.yml", packageJson]
+  // Use findUp to search for workspace markers in parent directories
+  const file = await findUp(
+    async directory => {
+      const dirContents = await readdir(directory)
+      const pkgJsonPath = path.join(directory, packageJson)
+
+      for (const filenameMarker of WORKSPACE_MARKERS) {
+        if (dirContents.includes(filenameMarker)) {
+          if (filenameMarker === packageJson) {
+            const rootWorkspaceConfigPath = await fs
+              .readJson(pkgJsonPath)
+              .then(pkg => (pkg.workspaces || pkg.pnpm || pkg.workspaces?.packages ? pkgJsonPath : undefined))
+              .catch(() => undefined) // ignore invalid package.json
+            if (rootWorkspaceConfigPath) {
+              return rootWorkspaceConfigPath
+            }
+          }
+          return path.join(directory, filenameMarker)
+        }
+      }
+      return dirContents.includes(".git") ? findUp.stop : undefined // stop searching if we hit a .git root directory
+    },
+    { cwd: startDir }
+  )
+  return file ? path.dirname(file) : undefined
+}
diff --git a/packages/app-builder-lib/src/node-module-collector/yarnNodeModulesCollector.ts b/packages/app-builder-lib/src/node-module-collector/yarnNodeModulesCollector.ts
index c2c882c898b..8d2dca1cf11 100644
--- a/packages/app-builder-lib/src/node-module-collector/yarnNodeModulesCollector.ts
+++ b/packages/app-builder-lib/src/node-module-collector/yarnNodeModulesCollector.ts
@@ -6,6 +6,5 @@ export class YarnNodeModulesCollector extends NpmNodeModulesCollector {
     super(rootDir)
   }
 
-  // note: do not override instance-var `pmCommand`. We explicitly use npm for the json payload
   public readonly installOptions = { manager: PM.YARN, lockfile: "yarn.lock" }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a9821ac73bd..97393c4f0b4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -155,6 +155,9 @@ importers:
       electron-publish:
         specifier: workspace:*
         version: link:../electron-publish
+      find-up:
+        specifier: ^5.0.0
+        version: 5.0.0
       fs-extra:
         specifier: ^10.1.0
         version: 10.1.0
@@ -261,6 +264,9 @@ importers:
       '@types/ejs':
         specifier: 3.1.0
         version: 3.1.0
+      '@types/find-up':
+        specifier: ^4.0.2
+        version: 4.0.2
       '@types/hosted-git-info':
         specifier: 3.0.2
         version: 3.0.2
@@ -2251,6 +2257,10 @@ packages:
   '@types/estree@1.0.7':
     resolution: {integrity: sha512-w28IoSUCJpidD/TGviZwwMJckNESJZXFu7NBZ5YJ4mEUnNraUn9Pm8HSZm/jDF1pDWYKspWE7oVphigUPRakIQ==}
 
+  '@types/find-up@4.0.2':
+    resolution: {integrity: sha512-AcxsY79jbVkizdp5BPS9jsMntFD9GTbQJp+HgSvzFvDIL0dgfy1TRHpyQxZkPkgp5oIK0lnaJ8m+qSZhBMIqbw==}
+    deprecated: This is a stub types definition. find-up provides its own type definitions, so you do not need this installed.
+
   '@types/fs-extra@11.0.4':
     resolution: {integrity: sha512-yTbItCNreRooED33qjunPthRcSjERP1r4MqCZc7wv0u2sUkzTFp45tgUfS5+r7FrZPdmCCNflLhVSP/o+SemsQ==}
 
@@ -7827,6 +7837,10 @@ snapshots:
 
   '@types/estree@1.0.7': {}
 
+  '@types/find-up@4.0.2':
+    dependencies:
+      find-up: 5.0.0
+
   '@types/fs-extra@11.0.4':
     dependencies:
       '@types/jsonfile': 6.1.4