diff --git a/src/debug/macho/file.go b/src/debug/macho/file.go
index 085b0c8..73cfce3 100644
--- a/src/debug/macho/file.go
+++ b/src/debug/macho/file.go
@@ -345,6 +345,15 @@
 			if err := binary.Read(b, bo, &hdr); err != nil {
 				return nil, err
 			}
+			if hdr.Iundefsym > uint32(len(f.Symtab.Syms)) {
+				return nil, &FormatError{offset, fmt.Sprintf(
+					"undefined symbols index in dynamic symbol table command is greater than symbol table length (%d > %d)",
+					hdr.Iundefsym, len(f.Symtab.Syms)), nil}
+			} else if hdr.Iundefsym+hdr.Nundefsym > uint32(len(f.Symtab.Syms)) {
+				return nil, &FormatError{offset, fmt.Sprintf(
+					"number of undefined symbols after index in dynamic symbol table command is greater than symbol table length (%d > %d)",
+					hdr.Iundefsym+hdr.Nundefsym, len(f.Symtab.Syms)), nil}
+			}
 			dat := make([]byte, hdr.Nindirectsyms*4)
 			if _, err := r.ReadAt(dat, int64(hdr.Indirectsymoff)); err != nil {
 				return nil, err
diff --git a/src/debug/macho/file_test.go b/src/debug/macho/file_test.go
index 03915c8..9beeb80 100644
--- a/src/debug/macho/file_test.go
+++ b/src/debug/macho/file_test.go
@@ -416,3 +416,10 @@
 		t.Errorf("got %v, want %v", TypeExec.GoString(), "macho.Exec")
 	}
 }
+
+func TestOpenBadDysymCmd(t *testing.T) {
+	_, err := openObscured("testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64")
+	if err == nil {
+		t.Fatal("openObscured did not fail when opening a file with an invalid dynamic symbol table command")
+	}
+}
diff --git a/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64 b/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64
new file mode 100644
index 0000000..8e04366
--- /dev/null
+++ b/src/debug/macho/testdata/gcc-amd64-darwin-exec-with-bad-dysym.base64
@@ -0,0 +1 @@
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\ No newline at end of file