diff --git a/src/cli/render/compact-diff-view.test.ts b/src/cli/render/compact-diff-view.test.ts
index 1fd2fb00..8614ff69 100644
--- a/src/cli/render/compact-diff-view.test.ts
+++ b/src/cli/render/compact-diff-view.test.ts
@@ -350,7 +350,13 @@ describe('compactDiffView', () => {
       // Raw control chars must not appear in the output
       expect(out).not.toContain('\x07');
       expect(out).not.toContain('\r');
-      expect(out).not.toContain('\n\n'); // only the stat/box separator newline is expected
+      // Assert directly that sanitization stripped the raw LF from the
+      // adversarial path: the stat header (first output line) must not contain
+      // an embedded newline. Asserting '\n\n' here would couple the test to
+      // drawBox's trailing-newline behavior rather than to path sanitization.
+      const statLine = strip(out).split('\n')[0];
+      expect(statLine).not.toContain('\x0A');
+      expect(statLine).not.toContain('https://evil.example'); // OSC payload stripped
       // The benign text fragments must survive
       expect(strip(out)).toContain('src/');
       expect(strip(out)).toContain('evil');
diff --git a/src/cli/render/compact-diff-view.ts b/src/cli/render/compact-diff-view.ts
index 7649998c..7c9309c7 100644
--- a/src/cli/render/compact-diff-view.ts
+++ b/src/cli/render/compact-diff-view.ts
@@ -176,10 +176,13 @@ export function compactDiffView(spec: CompactDiffSpec): string {
     bodyLines.push(palette.dim(`... and ${hidden} more ${noun}`));
   }
 
-  // Wrap body in a box. Width accounts for border + padding overhead (box adds
-  // 4 cols for borders and 2 cols for default padding = 6 total).
+  // Wrap body in a box. BOX_OVERHEAD matches the constant used in utils.ts
+  // (maxInnerBoxWidth): 2 border cols + 2×1 default padding col on each side = 6.
+  // Named here so a change to drawBox's padding default causes a single update
+  // rather than a silent numeric mismatch.
+  const BOX_OVERHEAD = 6; // 2 border + 2×padding(1) on each side — mirrors utils.ts
   const termWidth = spec.width ?? 80;
-  const innerWidth = Math.max(20, termWidth - 6);
+  const innerWidth = Math.max(20, termWidth - BOX_OVERHEAD);
   const boxed = drawBox(bodyLines, { width: innerWidth });
 
   return [statHeader, boxed].join('\n');