diff --git a/src/main/services/git/GitService.ts b/src/main/services/git/GitService.ts
index 54917ac1..2451c91c 100644
--- a/src/main/services/git/GitService.ts
+++ b/src/main/services/git/GitService.ts
@@ -758,9 +758,17 @@ export class GitService {
         }
       }
     } else {
-      // Regular commit: use show --name-status
-      const commitShow = await git.show([trimmedHash, '--name-status', '--pretty=format:%P']);
-      const lines = commitShow.split('\n').filter((line) => line.trim());
+      // Regular commit: use diff-tree to list changed files without patch output.
+      // `--root` ensures the initial commit reports its files too.
+      const diffTree = await git.raw([
+        'diff-tree',
+        '--root',
+        '--no-commit-id',
+        '--name-status',
+        '-r',
+        trimmedHash,
+      ]);
+      const lines = diffTree.split('\n').filter((line) => line.trim());
 
       for (const line of lines) {
         // Match: status (with optional percentage for R/C) and file path(s)
diff --git a/src/renderer/components/source-control/CommitDiffViewer.tsx b/src/renderer/components/source-control/CommitDiffViewer.tsx
index aecfadc5..1488a3c9 100644
--- a/src/renderer/components/source-control/CommitDiffViewer.tsx
+++ b/src/renderer/components/source-control/CommitDiffViewer.tsx
@@ -8,6 +8,7 @@ interface CommitDiffViewerProps {
   rootPath: string;
   fileDiff: FileDiff | null | undefined;
   filePath: string | null;
+  commitHash: string | null;
   isActive?: boolean;
   isLoading?: boolean;
   onPrevFile?: () => void;
@@ -20,6 +21,7 @@ export function CommitDiffViewer({
   rootPath,
   fileDiff,
   filePath,
+  commitHash,
   isActive = true,
   isLoading = false,
   onPrevFile,
@@ -65,6 +67,7 @@ export function CommitDiffViewer({
           isActive={isActive}
           diff={diffData}
           isCommitView
+          commitHash={commitHash}
           onPrevFile={onPrevFile}
           onNextFile={onNextFile}
           hasPrevFile={hasPrevFile}
diff --git a/src/renderer/components/source-control/DiffViewer.tsx b/src/renderer/components/source-control/DiffViewer.tsx
index d8f754ec..1fdae1d1 100644
--- a/src/renderer/components/source-control/DiffViewer.tsx
+++ b/src/renderer/components/source-control/DiffViewer.tsx
@@ -115,6 +115,7 @@ interface DiffViewerProps {
   diff?: FileDiff;
   skipFetch?: boolean;
   isCommitView?: boolean; // Add flag to indicate commit history view
+  commitHash?: string | null; // Used to scope Monaco models in commit view
 }
 
 export function DiffViewer({
@@ -128,6 +129,7 @@ export function DiffViewer({
   diff: externalDiff,
   skipFetch = false,
   isCommitView = false,
+  commitHash = null,
 }: DiffViewerProps) {
   const sessionId = useActiveSessionId(rootPath);
   const { t } = useI18n();
@@ -726,6 +728,9 @@ export function DiffViewer({
       setEditorReady(true);
 
       const currentModel = editor.getModel();
+      const mountedModels = currentModel
+        ? { original: currentModel.original, modified: currentModel.modified }
+        : null;
       if (currentModel) {
         modelsRef.current.original = currentModel.original;
         modelsRef.current.modified = currentModel.modified;
@@ -787,9 +792,16 @@ export function DiffViewer({
         for (const d of disposables) {
           d.dispose();
         }
+        // Prevent commit-view Monaco models from accumulating in memory.
+        // We intentionally keep worktree models cached for performance, but commit history
+        // can generate many unique models (commitHash scoped URIs), so dispose on unmount.
+        if (isCommitView && mountedModels) {
+          mountedModels.original?.dispose();
+          mountedModels.modified?.dispose();
+        }
       };
     },
-    [file?.path, performAutoNavigation]
+    [file?.path, performAutoNavigation, isCommitView]
   );
 
   // Toggle hide unchanged regions
@@ -1200,11 +1212,25 @@ export function DiffViewer({
       <div className="flex-1">
         {diff && diff.original != null && diff.modified != null && isThemeReady && (
           <DiffEditor
-            key={`${rootPath}-${file.path}-${file.staged}-${isThemeReady}-${isEditing}`}
+            key={
+              isCommitView
+                ? `${rootPath}-${commitHash ?? 'null'}-${file.path}-${file.staged}-${isThemeReady}-${isEditing}`
+                : `${rootPath}-${file.path}-${file.staged}-${isThemeReady}-${isEditing}`
+            }
             original={diff.original}
             modified={isEditing && editedContent !== null ? editedContent : diff.modified}
-            originalModelPath={toMonacoVirtualUri('inmemory', `original/${rootPath}/${file.path}`)}
-            modifiedModelPath={toMonacoVirtualUri('inmemory', `modified/${rootPath}/${file.path}`)}
+            originalModelPath={toMonacoVirtualUri(
+              'inmemory',
+              isCommitView && commitHash
+                ? `original/commit/${commitHash}/${rootPath}/${file.path}`
+                : `original/${rootPath}/${file.path}`
+            )}
+            modifiedModelPath={toMonacoVirtualUri(
+              'inmemory',
+              isCommitView && commitHash
+                ? `modified/commit/${commitHash}/${rootPath}/${file.path}`
+                : `modified/${rootPath}/${file.path}`
+            )}
             language={getLanguageFromPath(file.path)}
             theme={CUSTOM_THEME_NAME}
             onMount={handleEditorMount}
diff --git a/src/renderer/components/source-control/SourceControlPanel.tsx b/src/renderer/components/source-control/SourceControlPanel.tsx
index fa155eb9..157b0588 100644
--- a/src/renderer/components/source-control/SourceControlPanel.tsx
+++ b/src/renderer/components/source-control/SourceControlPanel.tsx
@@ -1282,6 +1282,7 @@ export function SourceControlPanel({
                 rootPath={selectedRepoPath ?? rootPath ?? ''}
                 fileDiff={commitDiff}
                 filePath={selectedCommitFile}
+                commitHash={selectedCommitHash}
                 isActive={isActive}
                 isLoading={commitDiffLoading}
                 onPrevFile={handlePrevCommitFile}